Curated Shelf

Biology

Darwin's Origin, Huxley — popular-level Victorian/Edwardian science writing.

1494 WorksDrawn from Project Gutenberg Bookshelf #669

Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.
Atkinson, George Francis
23,578 Gutenberg downloadsen2008Difficulty 50 (College)
The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.
Eyre, J. W. H. (John William Henry)
16,820 Gutenberg downloadsen2009Difficulty 59 (Graduate)
Life and Letters of Charles Darwin — Volume 1
Darwin, Charles
16,541 Gutenberg downloadsen2000Difficulty 54 (Graduate)
More Letters of Charles Darwin — Volume 1 A Record of His Work in a Series of Hitherto Unpublished Letters
Darwin, Charles
16,083 Gutenberg downloadsen2001Difficulty 50 (College)
On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition)
Darwin, Charles
13,695 Gutenberg downloadsen2007Difficulty 73 (Expert)
The Variation of Animals and Plants Under Domestication, Vol. I.
Darwin, Charles
13,072 Gutenberg downloadsen2008Difficulty 67 (Academic)
The Notebooks of Leonardo Da Vinci — Complete
Leonardo, da Vinci
12,425 Gutenberg downloadsen2004Difficulty 52 (Graduate)
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
Masters, Maxwell T. (Maxwell Tylden)
11,930 Gutenberg downloadsen2007Difficulty 61 (Academic)
Darwin, and After Darwin, Volumes 1 and 3 An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions
Romanes, George John
11,421 Gutenberg downloadsen2008Difficulty 55 (Graduate)
Contributions to the Theory of Natural Selection A Series of Essays
Wallace, Alfred Russel
11,042 Gutenberg downloadsen2007Difficulty 63 (Academic)
Cattle and Their Diseases Embracing Their History and Breeds, Crossing and Breeding, and Feeding and Management; with the Diseases to Which They Are Subject, and the Remedies Best Adapted to Their Cure
Jennings, Robert
10,875 Gutenberg downloadsen2007Difficulty 67 (Academic)
The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality
Schmid, Rudolf
10,051 Gutenberg downloadsen2007Difficulty 56 (Graduate)
The Natural History of Pliny, Volume 3 (of 6)
Pliny, the Elder
10,021 Gutenberg downloadsen2019Difficulty 38 (High School)
On the Origin of Species By Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life
Darwin, Charles
9,814 Gutenberg downloadsen1998Difficulty 61 (Academic)
Mysteries of Bee-keeping Explained
Quinby, M. (Moses)
9,639 Gutenberg downloadsen2008Difficulty 78 (Expert)
The Origin of Species by Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition
Darwin, Charles
8,647 Gutenberg downloadsen1999Difficulty 65 (Academic)
Evolution, Old & New Or, the Theories of Buffon, Dr. Erasmus Darwin and Lamarck, as compared with that of Charles Darwin
Butler, Samuel
8,505 Gutenberg downloadsen2007Difficulty 57 (Graduate)
Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases
Doane, Rennie Wilbur
7,357 Gutenberg downloadsen2009Difficulty 58 (Graduate)
Letters of Asa Gray; Vol. 2
Gray, Asa
7,220 Gutenberg downloadsen2017Difficulty 47 (College)
The Foundations of the Origin of Species Two Essays written in 1842 and 1844
Darwin, Charles
6,990 Gutenberg downloadsen2007Difficulty 56 (Graduate)
The Medicinal Plants of the Philippines
Pardo de Tavera, T. H. (Trinidad Hermenegildo)
6,966 Gutenberg downloadsen2008Difficulty 67 (Academic)
Birds of the Rockies
Keyser, Leander S. (Leander Sylvester)
6,948 Gutenberg downloadsen2008Difficulty 58 (Graduate)
Delineations of the Ox Tribe: The Natural History of Bulls, Bisons, and Buffaloes. Exhibiting all the Known Species and the More Remarkable Varieties of the Genus Bos.
Vasey, George
6,482 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Zoölogische Philosophie Of beschouwingen over de Natuurlijke Historie der dieren etc.
Lamarck, Jean Baptiste Pierre Antoine de Monet de
5,986 Gutenberg downloadsnl2008
The Dawn of Reason; or, Mental Traits in the Lower Animals
Weir, James, Jr.
5,896 Gutenberg downloadsen2007Difficulty 70 (Academic)
Sir Jagadis Chunder Bose, His Life and Speeches
Bose, Jagadis Chandra
5,892 Gutenberg downloadsen2007Difficulty 65 (Academic)
Man And His Ancestor: A Study In Evolution
Morris, Charles
5,842 Gutenberg downloadsen2009Difficulty 58 (Graduate)
Outlines of Dairy Bacteriology, 8th edition A Concise Manual for the Use of Students in Dairying
Russell, H. L. (Harry Luman)
5,613 Gutenberg downloadsen2009Difficulty 62 (Academic)
Species Plantarum, Sections IV-V
Linné, Carl von
5,132 Gutenberg downloadsla2008
Explanation of Terms Used in Entomology
Smith, John Bernhard
5,094 Gutenberg downloadsen2007Difficulty 57 (Graduate)
Makers of British Botany; a collection of biographies by living botanists
Unknown
5,025 Gutenberg downloadsen2014Difficulty 61 (Academic)
Evolution in Modern Thought
Unknown
4,883 Gutenberg downloadsen2007Difficulty 73 (Expert)
An Elementary Study of Insects
Haseman, Leonard
4,767 Gutenberg downloadsen2007Difficulty 51 (Graduate)
The Stock-Feeder's Manual the chemistry of food in relation to the breeding and feeding of live stock
Cameron, Charles Alexander, Sir
4,758 Gutenberg downloadsen2008Difficulty 59 (Graduate)
Rollo's Experiments
Abbott, Jacob
3,997 Gutenberg downloadsen2008Difficulty 35 (High School)
Freedom in Science and Teaching. from the German of Ernst Haeckel
Haeckel, Ernst
3,839 Gutenberg downloadsen2008Difficulty 73 (Expert)
At the Deathbed of Darwinism: A Series of Papers
Dennert, Eberhard
3,830 Gutenberg downloadsen2007Difficulty 68 (Academic)
Life and Matter: A Criticism of Professor Haeckel's "Riddle of the Universe"
Lodge, Oliver, Sir
3,803 Gutenberg downloadsen2008Difficulty 75 (Expert)
Are the Effects of Use and Disuse Inherited? An Examination of the View Held by Spencer and Darwin
Ball, W. P. (William Platt)
3,711 Gutenberg downloadsen2008Difficulty 68 (Academic)
The Expression of the Emotions in Man and Animals
Darwin, Charles
3,370 Gutenberg downloadsen1998Difficulty 64 (Academic)
On Growth and Form
Thompson, D'Arcy Wentworth
3,305 Gutenberg downloadsen2017Difficulty 53 (Graduate)
The Genus Pinus
Shaw, George Russell
2,910 Gutenberg downloadsen2008Difficulty 58 (Graduate)
The Variation of Animals and Plants under Domestication
Darwin, Charles
2,814 Gutenberg downloadsen2002Difficulty 86 (Specialist)
The Voyage of the Beagle
Darwin, Charles
2,721 Gutenberg downloadsen1997Difficulty 56 (Graduate)
Prof. Koch's Method to Cure Tuberculosis Popularly Treated
Birnbaum, Max
2,673 Gutenberg downloadsen2008Difficulty 59 (Graduate)
Handbook of Birmingham Prepared for the Members of the British Association, 1886
British Association for the Advancement of Science
2,560 Gutenberg downloadsen2015Difficulty 51 (Graduate)
Mental Evolution in Man: Origin of Human Faculty
Romanes, George John
2,543 Gutenberg downloadsen2015Difficulty 68 (Academic)
The Common Spiders of the United States
Emerton, J. H. (James Henry)
2,521 Gutenberg downloadsen2013Difficulty 45 (College)
The Descent of Man, and Selection in Relation to Sex
Darwin, Charles
2,396 Gutenberg downloadsen2000Difficulty 69 (Academic)
Pharmacographia A history of the principal drugs of vegetable origin, met with in Great Britain and British India
Flückiger, Friedrich A. (Friedrich August) & Hanbury, Daniel
2,293 Gutenberg downloadsen2022Difficulty 66 (Academic)
The Animal Parasites of Man
Fantham, Harold Benjamin & Braun, Max & Stephens, J. W. W. (John William Watson) & Theobald, Fred. V. (Frederick Vincent)
2,254 Gutenberg downloadsen2018Difficulty 67 (Academic)
Encyclopaedia Britannica, 11th Edition, "Echinoderma" to "Edward, prince of Wales" Volume 8, Slice 10
Various
2,217 Gutenberg downloadsen2011Difficulty 65 (Academic)
Aristotle's History of Animals In Ten Books
Aristotle
2,173 Gutenberg downloadsen2019Difficulty 55 (Graduate)
Scurvy, Past and Present
Hess, Alfred F.
2,172 Gutenberg downloadsen2012Difficulty 62 (Academic)
Herbal Simples Approved for Modern Uses of Cure
Fernie, William Thomas
2,165 Gutenberg downloadsen2006Difficulty 54 (Graduate)
Travels in Peru and India While Superintending the Collection of Chinchona Plants and Seeds in South America, and Their Introduction into India.
Markham, Clements R. (Clements Robert), Sir
2,153 Gutenberg downloadsen2017Difficulty 62 (Academic)
Sketches of the Natural History of Ceylon
Tennent, James Emerson, Sir
2,120 Gutenberg downloadsen2004Difficulty 72 (Expert)
Toadstools, mushrooms, fungi, edible and poisonous; one thousand American fungi How to select and cook the edible; how to distinguish and avoid the poisonous, with full botanic descriptions. Toadstool poisons and their treatment, instructions to students, recipes for cooking, etc., etc.
McIlvaine, Charles & Macadam, Robert K.
2,094 Gutenberg downloadsen2016Difficulty 54 (Graduate)
The Moths of the British Isles, First Series Comprising the Families Sphingidæ to Noctuidæ
South, Richard
2,091 Gutenberg downloadsen2013Difficulty 54 (Graduate)
The book of wonders : $b gives plain and simple answers to the thousands of everyday questions that are asked and which all should be able to, but cannot answer...
Unknown
2,069 Gutenberg downloadsen2025Difficulty 48 (College)
The Natural History of Pliny, Volume 5 (of 6)
Pliny, the Elder
1,989 Gutenberg downloadsen2019Difficulty 50 (College)
Beginners' zoology
Coleman, Walter Moore
1,918 Gutenberg downloadsen2024Difficulty 46 (College)
Parasites: A Treatise on the Entozoa of Man and Animals Including Some Account of the Ectozoa
Cobbold, T. Spencer (Thomas Spencer)
1,914 Gutenberg downloadsen2014Difficulty 60 (Graduate)
The Biotic Associations of Cockroaches
Roth, Louis M. (Louis Marcus) & Willis, Edwin R.
1,850 Gutenberg downloadsen2014Difficulty 71 (Expert)
The Evolution of Man
Haeckel, Ernst
1,822 Gutenberg downloadsen2005Difficulty 49 (College)
Encyclopaedia Britannica, 11th Edition, "Foraminifera" to "Fox, Edward" Volume 10, Slice 6
Various
1,810 Gutenberg downloadsen2011Difficulty 67 (Academic)
The Cambridge natural history, Vol. 10 (of 10)
Beddard, Frank E. (Frank Evers)
1,771 Gutenberg downloadsen2012Difficulty 61 (Academic)
Origin of Cultivated Plants The International Scientific Series Volume XLVIII
Candolle, Alphonse de
1,745 Gutenberg downloadsen2014Difficulty 62 (Academic)
The Story-book of Science
Fabre, Jean-Henri
1,710 Gutenberg downloadsen2018Difficulty 43 (College)
Micrographia Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with Observations and Inquiries Thereupon
Hooke, Robert
1,698 Gutenberg downloadsen2005Difficulty 76 (Expert)
Encyclopaedia Britannica, 11th Edition, "Matter" to "Mecklenburg" Volume 17, Slice 8
Various
1,694 Gutenberg downloadsen2013Difficulty 71 (Expert)
The Descent of Man and Selection in Relation to Sex, Vol. I
Darwin, Charles
1,660 Gutenberg downloadsen2011Difficulty 65 (Academic)
The Book of the Pearl The history, art, science, and industry of the queen of gems
Kunz, George Frederick & Stevenson, Charles Hugh
1,647 Gutenberg downloadsen2020Difficulty 64 (Academic)
Lamarck, the Founder of Evolution: His Life and Work
Packard, A. S. (Alpheus Spring)
1,640 Gutenberg downloadsen2007Difficulty 58 (Graduate)
Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII
Haeckel, Ernst
1,622 Gutenberg downloadsen2013Difficulty 64 (Academic)
Australian insects
Froggatt, Walter W. (Walter Wilson)
1,620 Gutenberg downloadsen2025Difficulty 52 (Graduate)
The Insect World Being a Popular Account of the Orders of Insects; Together with a Description of the Habits and Economy of Some of the Most Interesting Species
Figuier, Louis
1,595 Gutenberg downloadsen2014Difficulty 55 (Graduate)
A system of practical medicine. By American authors. Vol. 1 : $b Pathology and general diseases
Unknown
1,584 Gutenberg downloadsen2012Difficulty 63 (Academic)
Butterflies and Moths (British)
Furneaux, William S.
1,548 Gutenberg downloadsen2010Difficulty 44 (College)
Encyclopaedia Britannica, 11th Edition, "Ichthyology" to "Independence" Volume 14, Slice 3
Various
1,546 Gutenberg downloadsen2012Difficulty 67 (Academic)
Manual of the Trees of North America (Exclusive of Mexico) 2nd ed.
Sargent, Charles Sprague
1,505 Gutenberg downloadsen2014Difficulty 78 (Expert)
Form and Function: A Contribution to the History of Animal Morphology
Russell, E. S. (Edward Stuart)
1,495 Gutenberg downloadsen2007Difficulty 59 (Graduate)
The Principles of Biology, Volume 1 (of 2)
Spencer, Herbert
1,472 Gutenberg downloadsen2017Difficulty 63 (Academic)
The Journal of a Disappointed Man
Barbellion, W. N. P.
1,467 Gutenberg downloadsen2012Difficulty 42 (College)
Woman in Science With an Introductory Chapter on Woman's Long Struggle for Things of the Mind
Zahm, J. A. (John Augustine)
1,456 Gutenberg downloadsen2011Difficulty 66 (Academic)
A Civic Biology, Presented in Problems
Hunter, George W. (George William)
1,455 Gutenberg downloadsen2012Difficulty 56 (Graduate)
The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
Thomson, J. Arthur (John Arthur)
1,439 Gutenberg downloadsen2007Difficulty 66 (Academic)
Identification of the Larger Fungi
Watling, Roy
1,428 Gutenberg downloadsen2019Difficulty 62 (Academic)
A text-book of veterinary anatomy
Sisson, Septimus
1,423 Gutenberg downloadsen2025Difficulty 76 (Expert)
American Forest Trees
Gibson, Henry H.
1,422 Gutenberg downloadsen2013Difficulty 50 (College)
Journal of Researches into the Natural History and Geology of the Countries Visited During the Voyage Round the World of H.M.S. Beagle Under the Command of Captain Fitz Roy, R.N.
Darwin, Charles
1,410 Gutenberg downloadsen2003Difficulty 66 (Academic)
The pears of New York
Hedrick, U. P.
1,406 Gutenberg downloadsen2014Difficulty 58 (Graduate)
How to Use the Popular Science Library; History of Science; General Index
Serviss, Garrett Putman & Selwyn-Brown, Arthur
1,393 Gutenberg downloadsen2016Difficulty 64 (Academic)
New Zealand Moths and Butterflies (Macro-Lepidoptera)
Hudson, G. V. (George Vernon)
1,384 Gutenberg downloadsen2013Difficulty 60 (Graduate)
Cosmos: A Sketch of the Physical Description of the Universe, Vol. 1
Humboldt, Alexander von
1,382 Gutenberg downloadsen2005Difficulty 67 (Academic)
Fungi: Their Nature and Uses
Cooke, M. C. (Mordecai Cubitt)
1,374 Gutenberg downloadsen2009Difficulty 57 (Graduate)
General Science
Clark, Bertha May
1,351 Gutenberg downloadsen2005Difficulty 53 (Graduate)
Student's Hand-book of Mushrooms of America, Edible and Poisonous
Taylor, Thomas
1,337 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Himalayan Journals — Complete Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.
Hooker, Joseph Dalton
1,326 Gutenberg downloadsen2004Difficulty 99 (Quantum Electrodynamics)
A Guide to the Study of Fishes, Volume 2 (of 2)
Jordan, David Starr
1,325 Gutenberg downloadsen2016Difficulty 83 (Specialist)
Applied Eugenics
Popenoe, Paul & Johnson, Roswell H. (Roswell Hill)
1,325 Gutenberg downloadsen2006Difficulty 55 (Graduate)
The Progress of the Century
Unknown
1,325 Gutenberg downloadsen2017Difficulty 69 (Academic)
The Malay Archipelago, Volume 1 The Land of the Orang-utan and the Bird of Paradise; A Narrative of Travel, with Studies of Man and Nature
Wallace, Alfred Russel
1,318 Gutenberg downloadsen2001Difficulty 63 (Academic)
Mammals of Mesa Verde National Park, Colorado
Anderson, Sydney
1,315 Gutenberg downloadsen2010Difficulty 53 (Graduate)
The Moths of the British Isles, Second Series Comprising the Families Noctuidæ to Hepialidæ
South, Richard
1,309 Gutenberg downloadsen2013Difficulty 50 (College)
Biographies of distinguished scientific men. First series
Arago, F. (François)
1,302 Gutenberg downloadsen2005Difficulty 52 (Graduate)
The Autobiography of Charles Darwin
Darwin, Charles
1,301 Gutenberg downloadsen1999Difficulty 53 (Graduate)
Life and Letters of Charles Darwin — Volume 2
Darwin, Charles
1,293 Gutenberg downloadsen2000Difficulty 53 (Graduate)
Handbook of Medical Entomology
Riley, William A. (William Albert) & Johannsen, O. A. (Oskar Augustus)
1,289 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Man, Past and Present
Keane, A. H. (Augustus Henry)
1,279 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Darwin and Modern Science
Seward, A. C. (Albert Charles)
1,257 Gutenberg downloadsen1999Difficulty 56 (Graduate)
Snakes: Curiosities and Wonders of Serpent Life
Hopley, Catherine Cooper
1,250 Gutenberg downloadsen2016Difficulty 56 (Graduate)
A History of North American Birds; Land Birds; Vol. 3 of 3
Baird, Spencer Fullerton & Brewer, T. M. (Thomas Mayo) & Ridgway, Robert
1,247 Gutenberg downloadsen2017Difficulty 59 (Graduate)
Fabre's Book of Insects
Fabre, Jean-Henri
1,247 Gutenberg downloadsen2021Difficulty 43 (College)
Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries
Griffith, William
1,244 Gutenberg downloadsen2005Difficulty 54 (Graduate)
Galen: On the Natural Faculties
Galen
1,240 Gutenberg downloadsen2013Difficulty 65 (Academic)
Wild Flowers An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors
Blanchan, Neltje
1,240 Gutenberg downloadsen2002Difficulty 58 (Graduate)
Encyclopaedia Britannica, 11th Edition, "Joints" to "Justinian I." Volume 15, Slice 5
Various
1,232 Gutenberg downloadsen2012Difficulty 65 (Academic)
Syndrome
Hoover, Thomas
1,231 Gutenberg downloadsen2010Difficulty 42 (College)
Domestic Animals History and description of the horse, mule, cattle, sheep, swine, poultry and farm dogs; with directions for their management, breeding, crossing, rearing, feeding, and preparation for a profitable market; also their diseases and remedies. Together with full directions for the management of the dairy.
Allen, Richard Lamb
1,229 Gutenberg downloadsen2010Difficulty 72 (Expert)
The grapes of New York
Hedrick, U. P.
1,222 Gutenberg downloadsen2014Difficulty 63 (Academic)
Tobacco; Its History, Varieties, Culture, Manufacture and Commerce
Billings, E. R.
1,206 Gutenberg downloadsen2008Difficulty 60 (Graduate)
Special report on diseases of cattle
United States. Bureau of Animal Industry & Atkinson, V. T. (Vickers T.) & Dickson, Dr. (William) & Eichhorn, A. (Adolph) & Hickman, Richard W. (Richard West) & Law, James & Lowe, (Dr.) (William Herbert) & Marsh, C. Dwight (Charles Dwight) & Mohler, John R. (John Robbins) & Murray, A. J. (Alexander James) & Pearson, Leonard & Ransom, Brayton Howard & Trumbower, M. R. (Milton R.) & Woodward, Dr. (Benjamin Tilghman)
1,202 Gutenberg downloadsen2009Difficulty 53 (Graduate)
The works of Francis Maitland Balfour, Volume 3 (of 4) : $b A treatise on comparative embryology: Vertebrata
Balfour, Francis M. (Francis Maitland)
1,200 Gutenberg downloadsen2014Difficulty 54 (Graduate)
The Romance of Plant Life Interesting Descriptions of the Strange and Curious in the Plant World
Elliot, G. F. Scott (George Francis Scott)
1,194 Gutenberg downloadsen2014Difficulty 71 (Expert)
Studies in the History and Method of Science, vol. 1 (of 2)
Unknown
1,191 Gutenberg downloadsen2014Difficulty 57 (Graduate)
Charles Darwin: His Life Told in an Autobiographical Chapter, and in a Selected Series of His Published Letters
Darwin, Charles
1,187 Gutenberg downloadsen2012Difficulty 53 (Graduate)
The Cambridge natural history, Vol. 03 (of 10)
Cooke, A. H. (Alfred Hands) & Reed, F. R. C. (Frederick Richard Cowper)
1,181 Gutenberg downloadsen2023Difficulty 63 (Academic)
The Vertebrate Skeleton
Reynolds, Sidney H. (Sidney Hugh)
1,177 Gutenberg downloadsen2013Difficulty 64 (Academic)
Argentine Ornithology, Volume 1 (of 2) A descriptive catalogue of the birds of the Argentine Republic.
Sclater, Philip Lutley & Hudson, W. H. (William Henry)
1,175 Gutenberg downloadsen2012Difficulty 62 (Academic)
A Guide to the Study of Fishes, Volume 1 (of 2)
Jordan, David Starr
1,174 Gutenberg downloadsen2014Difficulty 66 (Academic)
History of the Conflict Between Religion and Science
Draper, John William
1,168 Gutenberg downloadsen1998Difficulty 62 (Academic)
Reptiles and Birds A Popular Account of Their Various Orders, With a Description of the Habits and Economy of the Most Interesting
Figuier, Louis
1,152 Gutenberg downloadsen2014Difficulty 79 (Expert)
The Life of the Spider
Fabre, Jean-Henri
1,149 Gutenberg downloadsen1999Difficulty 52 (Graduate)
The Science of Fingerprints: Classification and Uses
United States. Federal Bureau of Investigation
1,149 Gutenberg downloadsen2006Difficulty 61 (Academic)
Insectivorous Plants
Darwin, Charles
1,148 Gutenberg downloadsen2004Difficulty 63 (Academic)
The Life of the Fly; With Which are Interspersed Some Chapters of Autobiography
Fabre, Jean-Henri
1,140 Gutenberg downloadsen2002Difficulty 54 (Graduate)
The Origin of Vertebrates
Gaskell, Walter Holbrook
1,136 Gutenberg downloadsen2013Difficulty 82 (Specialist)
A Journey in Brazil
Agassiz, Louis & Agassiz, Elizabeth Cabot Cary
1,127 Gutenberg downloadsen2017Difficulty 55 (Graduate)
Directions for Collecting and Preserving Insects
Riley, Charles V. (Charles Valentine)
1,127 Gutenberg downloadsen2012Difficulty 70 (Academic)
Elements of Physiophilosophy
Oken, Lorenz
1,127 Gutenberg downloadsen2015Difficulty 61 (Academic)
American Pomology. Apples
Warder, J. A. (John Aston)
1,123 Gutenberg downloadsen2011Difficulty 64 (Academic)
Lives of Eminent Zoologists, from Aristotle to Linnæus with Introductory remarks on the Study of Natural History
MacGillivray, William
1,121 Gutenberg downloadsen2010Difficulty 84 (Specialist)
The Bird Book Illustrating in natural colors more than seven hundred North American birds; also several hundred photographs of their nests and eggs.
Reed, Chester A. (Chester Albert)
1,111 Gutenberg downloadsen2009Difficulty 47 (College)
A Manual of Philippine Birds
McGregor, Richard C. (Richard Crittenden)
1,104 Gutenberg downloadsen2014Difficulty 68 (Academic)
The Naturalist on the River Amazons
Bates, Henry Walter
1,103 Gutenberg downloadsen2000Difficulty 67 (Academic)
Elementary Zoology, Second Edition
Kellogg, Vernon L. (Vernon Lyman)
1,102 Gutenberg downloadsen2012Difficulty 57 (Graduate)
The Cambridge natural history, Vol. 06 (of 10)
Sharp, David
1,102 Gutenberg downloadsen2023Difficulty 65 (Academic)
A Text-book of Entomology Including the Anatomy, Physiology, Embryology and Metamorphoses of Insects for Use in Agricultural and Technical Schools and Colleges as Well as by the Working Entomologist
Packard, A. S. (Alpheus Spring)
1,100 Gutenberg downloadsen2021Difficulty 63 (Academic)
An introduction to the study of mammals living and extinct
Flower, William Henry & Lydekker, Richard
1,100 Gutenberg downloadsen2025Difficulty 77 (Expert)
Langstroth on the Hive and the Honey-Bee: A Bee Keeper's Manual
Langstroth, L. L. (Lorenzo Lorraine)
1,100 Gutenberg downloadsen2008Difficulty 44 (College)
Catalogue of Economic Plants in the Collection of the U. S. Department of Agriculture
Saunders, William
1,096 Gutenberg downloadsen2008Difficulty 52 (Graduate)
An Introduction to Entomology: Vol. 3 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
1,093 Gutenberg downloadsen2013Difficulty 61 (Academic)
Everyday Objects; Or, Picturesque Aspects of Natural History.
Adams, W. H. Davenport (William Henry Davenport)
1,092 Gutenberg downloadsen2014Difficulty 57 (Graduate)
The Cambridge natural history, Vol. 07 (of 10)
Boulenger, George Albert & Bridge, T. W. (Thomas William) & Herdman, W. A. (William Abbott), Sir
1,092 Gutenberg downloadsen2024Difficulty 76 (Expert)
Nature's Teachings: Human Invention Anticipated by Nature
Wood, J. G. (John George)
1,088 Gutenberg downloadsen2016Difficulty 51 (Graduate)
Zoonomia; Or, the Laws of Organic Life, Vol. I
Darwin, Erasmus
1,085 Gutenberg downloadsen2005Difficulty 64 (Academic)
Zoölogy: The Science of Animal Life Popular Science Library, Volume XII (of 16), P. F. Collier & Son Company, 1922
Ingersoll, Ernest
1,084 Gutenberg downloadsen2015Difficulty 63 (Academic)
Life histories of North American shore birds, Part 1 (of 2)
Bent, Arthur Cleveland
1,070 Gutenberg downloadsen2014Difficulty 62 (Academic)
The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee
Gray, Asa
1,067 Gutenberg downloadsen2012Difficulty 60 (Graduate)
The Sea and Its Living Wonders A Popular Account of the Marvels of the Deep and of the Progress of Martime Discovery from the Earliest Ages to the Present Time
Hartwig, G. (Georg)
1,066 Gutenberg downloadsen2020Difficulty 62 (Academic)
Herbals, Their Origin and Evolution: A Chapter in the History of Botany 1470-1670
Arber, Agnes Robertson
1,065 Gutenberg downloadsen2014Difficulty 55 (Graduate)
The works of Francis Maitland Balfour, Volume 1 (of 4) : $b Separate memoirs
Balfour, Francis M. (Francis Maitland)
1,065 Gutenberg downloadsen2012Difficulty 58 (Graduate)
The Ocean World: Being a Description of the Sea and Its Living Inhabitants.
Figuier, Louis
1,060 Gutenberg downloadsen2014Difficulty 56 (Graduate)
More Letters of Charles Darwin — Volume 2 A Record of His Work in a Series of Hitherto Unpublished Letters
Darwin, Charles
1,052 Gutenberg downloadsen2001Difficulty 50 (College)
Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1
Humboldt, Alexander von & Bonpland, Aimé
1,050 Gutenberg downloadsen2004Difficulty 55 (Graduate)
The Sea-beach at Ebb-tide A Guide to the Study of the Seaweeds and the Lower Animal Life Found Between Tide-marks
Arnold, Augusta Foote
1,046 Gutenberg downloadsen2013Difficulty 57 (Graduate)
Animal Life and Intelligence
Morgan, C. Lloyd (Conwy Lloyd)
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The Cambridge natural history, Vol. 01 (of 10)
Hartog, Marcus & Hickson, Sydney J. (Sydney John) & MacBride, E. W. (Ernest William) & Sollas, Igerna Brünhilda Johnson
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Cassell's Natural History, Vol. 1 (of 6)
Unknown
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Webb, Robert G. (Robert Gravem)
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The Elements of Botany, For Beginners and For Schools
Gray, Asa
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Sex-linked Inheritance in Drosophila
Morgan, Thomas Hunt & Bridges, Calvin B. (Calvin Blackman)
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The Birds of Washington (Volume 1 of 2) A complete, scientific and popular account of the 372 species of birds found in the state
Dawson, William Leon & Bowles, John Hooper
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The Life of the Bee
Maeterlinck, Maurice
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Narrative of the Circumnavigation of the Globe by the Austrian Frigate Novara, Volume II (Commodore B. Von Wullerstorf-Urbair,) Undertaken by Order of the Imperial Government in the Years 1857, 1858, & 1859, Under the Immediate Auspices of His I. and R. Highness the Archduke Ferdinand Maximilian, Commander-In-Chief of the Austrian Navy.
Scherzer, Karl, Ritter von
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American Weasels
Hall, E. Raymond (Eugene Raymond)
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Life histories of North American wood warblers, Part 1 (of 2)
Bent, Arthur Cleveland
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The life of Jean Henri Fabre, the entomologist, 1823-1910
Fabre, Augustin
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Hogg, Jabez
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Britton, Thomas Allen
1,006 Gutenberg downloadsen2017Difficulty 57 (Graduate)
Cassell's Natural History, Vol. 2 (of 6)
Unknown
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Insect Architecture
Rennie, James
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Bass, Pike, Perch, and Others
Henshall, James A. (James Alexander)
995 Gutenberg downloadsen2012Difficulty 57 (Graduate)
A History of North American Birds; Land Birds; Vol. 1 of 3
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993 Gutenberg downloadsen2017Difficulty 66 (Academic)
Botany: The Science of Plant Life
Taylor, Norman
992 Gutenberg downloadsen2015Difficulty 56 (Graduate)
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Gould, John
990 Gutenberg downloadsen2019Difficulty 64 (Academic)
The North American Slime-Moulds A Descriptive List of All Species of Myxomycetes Hitherto Reported from the Continent of North America, with Notes on Some Extra-Limital Species
Macbride, Thomas H. (Thomas Huston)
980 Gutenberg downloadsen2010Difficulty 63 (Academic)
The History of Creation, Vol. 1 (of 2) Or the Development of the Earth and its Inhabitants by the Action of Natural Causes
Haeckel, Ernst
977 Gutenberg downloadsen2012Difficulty 64 (Academic)
Darwinism (1889) An exposition of the theory of natural selection, with some of its applications
Wallace, Alfred Russel
975 Gutenberg downloadsen2005Difficulty 82 (Specialist)
Lichens
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The flowering plants of Africa An analytical key to the genera of African phanerograms
Thonner, Franz
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972 Gutenberg downloadsen2005Difficulty 65 (Academic)
The Nature of Animal Light
Harvey, E. Newton (Edmund Newton)
967 Gutenberg downloadsen2010Difficulty 71 (Expert)
Cave Hunting Researches on the evidence of caves respecting the early inhabitants of Europe
Dawkins, William Boyd
963 Gutenberg downloadsen2016Difficulty 77 (Expert)
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Pfungst, Oskar
961 Gutenberg downloadsen2010Difficulty 57 (Graduate)
The Life of Crustacea
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960 Gutenberg downloadsen2012Difficulty 51 (Graduate)
The Cambridge natural history, Vol. 08 (of 10)
Gadow, Hans
948 Gutenberg downloadsen2024Difficulty 63 (Academic)
The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science
Nicholson, Henry Alleyne
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The Dog
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A Review of the Systems of Ethics Founded on the Theory of Evolution
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Mattoon, Wilbur R. (Wilbur Reed) & Webster, C. B. (Cyril Bertram)
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Scientific American magazine Vol 2. No. 3 Oct 10 1846 The Advocate of Industry and Journal of Scientific, Mechanical and Other Improvements
Various
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Alfred Russel Wallace: Letters and Reminiscences, Vol. 1
Wallace, Alfred Russel & Marchant, James, Sir
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The Power of Movement in Plants
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Various
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Thomas Henry Huxley; A Sketch Of His Life And Work
Mitchell, P. Chalmers (Peter Chalmers), Sir
930 Gutenberg downloadsen2005Difficulty 68 (Academic)
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Various
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925 Gutenberg downloadsen2014Difficulty 57 (Graduate)
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Woolfenden, Glen Everett
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Animal Intelligence The International Scientific Series, Vol. XLIV.
Romanes, George John
924 Gutenberg downloadsen2012Difficulty 58 (Graduate)
The Glow-Worm and Other Beetles
Fabre, Jean-Henri
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The Cambridge natural history, Vol. 09 (of 10)
Evans, A. H. (Arthur Humble)
922 Gutenberg downloadsen2024Difficulty 59 (Graduate)
Histoire des légumes
Gibault, Georges
919 Gutenberg downloadsfr2021
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Galton, Francis
917 Gutenberg downloadsen2004Difficulty 79 (Expert)
Fossil plants, Vol. 3 : $b A text-book for students of botany and geology
Seward, A. C. (Albert Charles)
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Neotropical Hylid Frogs, Genus Smilisca
Duellman, William Edward & Trueb, Linda
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The Bacillus of Long Life A Manual of the Preparation and Souring of Milk for Dietary Purposes, Together with an Historical Account of the Use of Fermented Milks, from the Earliest Times to the Present Day, and Their Wonderful Effect in the Prolonging of Human Existence
Douglas, Loudon M.
915 Gutenberg downloadsen2010Difficulty 56 (Graduate)
Life and Letters of Thomas Henry Huxley — Volume 3
Huxley, Thomas Henry
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Social Life in the Insect World
Fabre, Jean-Henri
912 Gutenberg downloadsen2006Difficulty 49 (College)
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Cassell's book of birds; vol. 1
Brehm, Alfred Edmund
908 Gutenberg downloadsen2015Difficulty 61 (Academic)
The Harvest of the Sea A contribution to the natural and economic history of the British food fishes
Bertram, James Glass
906 Gutenberg downloadsen2020Difficulty 66 (Academic)
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903 Gutenberg downloadsen2011Difficulty 58 (Graduate)
The Descent of Man and Selection in Relation to Sex, Vol. II (1st Edition)
Darwin, Charles
899 Gutenberg downloadsen2011Difficulty 59 (Graduate)
Evidence as to Man's Place in Nature
Huxley, Thomas Henry
896 Gutenberg downloadsen2001Difficulty 56 (Graduate)
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Galton, Francis
896 Gutenberg downloadsen2011Difficulty 62 (Academic)
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Philp, Robert Kemp
896 Gutenberg downloadsen2014Difficulty 86 (Specialist)
Mammals of Washington, Volume 2 University of Kansas Publications Museum of Natural History
Dalquest, Walter Woelber
895 Gutenberg downloadsen2016Difficulty 52 (Graduate)
Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Plates Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII
Haeckel, Ernst
894 Gutenberg downloadsen2013Difficulty 53 (Graduate)
Extinct Monsters A Popular Account of Some of the Larger Forms of Ancient Animal Life
Hutchinson, H. N. (Henry Neville)
893 Gutenberg downloadsen2013Difficulty 53 (Graduate)
A History of Science — Volume 5
Williams, Henry Smith & Williams, Edward Huntington
892 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Falling in Love; With Other Essays on More Exact Branches of Science
Allen, Grant
892 Gutenberg downloadsen2005Difficulty 64 (Academic)
Mutual Aid: A Factor of Evolution
Kropotkin, Petr Alekseevich, kniaz
892 Gutenberg downloadsen2003Difficulty 73 (Expert)
The Cambridge natural history, Vol. 02 (of 10)
Beddard, Frank E. (Frank Evers) & Benham, W. B. (William Blaxland) & Gamble, F. W. (Frederick William) & Hartog, Marcus & Sheldon, Lilian
892 Gutenberg downloadsen2023Difficulty 74 (Expert)
Venoms: Venomous Animals and Antivenomous Serum-therapeutics
Calmette, A. (Albert)
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A History of Science — Volume 2
Williams, Henry Smith & Williams, Edward Huntington
890 Gutenberg downloadsen1999Difficulty 63 (Academic)
Reflections on the Decline of Science in England, and on Some of Its Causes
Babbage, Charles
888 Gutenberg downloadsen1998Difficulty 63 (Academic)
Island Life; Or, The Phenomena and Causes of Insular Faunas and Floras
Wallace, Alfred Russel
887 Gutenberg downloadsen2010Difficulty 89 (Specialist)
The Plants of Michigan Simple Keys for the Identification of the Native Seed Plants of the State
Gleason, Henry A. (Henry Allan)
884 Gutenberg downloadsen2010Difficulty 45 (College)
An Introduction to Entomology: Vol. 4 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
883 Gutenberg downloadsen2013Difficulty 68 (Academic)
A History of Science — Volume 1
Williams, Henry Smith & Williams, Edward Huntington
878 Gutenberg downloadsen1999Difficulty 65 (Academic)
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Sclater, Philip Lutley & Hudson, W. H. (William Henry)
878 Gutenberg downloadsen2012Difficulty 56 (Graduate)
Species and Varieties, Their Origin by Mutation
Vries, Hugo de
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Scientific American Supplement, No. 841, February 13, 1892
Various
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872 Gutenberg downloadsen2013Difficulty 67 (Academic)
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Cuyer, Édouard
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Bent, Arthur Cleveland
869 Gutenberg downloadsen2024Difficulty 65 (Academic)
The World's Greatest Books — Volume 15 — Science
Unknown
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Washburne, Carleton
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Furneaux, William S.
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Flora of the Sudan
Broun, A. F. (Alfred Forbes) & Massey, R. E. (Reginald Ernest)
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The Riddle of the Universe at the close of the nineteenth century
Haeckel, Ernst
861 Gutenberg downloadsen2013Difficulty 72 (Expert)
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Furneaux, William S.
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Man's Place in Nature, and Other Essays
Huxley, Thomas Henry
860 Gutenberg downloadsen2012Difficulty 65 (Academic)
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Morrey, Charles Bradfield
860 Gutenberg downloadsen2013Difficulty 67 (Academic)
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859 Gutenberg downloadsen2002Difficulty 52 (Graduate)
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858 Gutenberg downloadsen2017Difficulty 46 (College)
A History of Science — Volume 4
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853 Gutenberg downloadsen1999Difficulty 68 (Academic)
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Bettany, G. T. (George Thomas)
853 Gutenberg downloadsen2009Difficulty 63 (Academic)
The Natural History of the Varieties of Man
Latham, R. G. (Robert Gordon)
850 Gutenberg downloadsen2014Difficulty 64 (Academic)
The Formation of Vegetable Mould Through the Action of Worms With Observations on Their Habits
Darwin, Charles
847 Gutenberg downloadsen2000Difficulty 63 (Academic)
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Wallace, Alfred Russel
845 Gutenberg downloadsen2023Difficulty 65 (Academic)
The Cambridge natural history, Vol. 05 (of 10)
Sedgwick, Adam & Sharp, David & Sinclair, F. G. (Frederick Granville)
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History of Botany (1530-1860)
Sachs, Julius
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Fabre, Jean-Henri
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A Synopsis of the Birds of North America
Audubon, John James
838 Gutenberg downloadsen2013Difficulty 50 (College)
William Harvey and the Discovery of the Circulation of the Blood
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The Amphibians and Reptiles of Michoacán, México
Duellman, William Edward
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Louis Agassiz: His Life and Correspondence
Agassiz, Louis
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Cassell's book of birds; vol. 4
Brehm, Alfred Edmund
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The Prolongation of Life: Optimistic Studies
Metchnikoff, Elie
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South, Richard
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Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Second Part: Subclass Osculosa; Index Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII
Haeckel, Ernst
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The Avifauna of Micronesia, Its Origin, Evolution, and Distribution
Baker, Rollin H. (Rollin Harold)
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The Butterfly Book A Popular Guide to a Knowledge of the Butterflies of North America
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Lely, Hugh Vandervaes
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The Natural History of Cage Birds Their Management, Habits, Food, Diseases, Treatment, Breeding, and the Methods of Catching Them.
Bechstein, Johann Matthäus
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A Monograph on the Sub-class Cirripedia (Volume 1 of 2) The Lepadidae; Or, Pedunculated Cirripedes
Darwin, Charles
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Linnean Society of London
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Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
Campbell, Douglas Houghton
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Ehrlich, Paul & Lazarus, Adolf
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Step, Edward
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Essays Upon Some Controverted Questions
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Harper, Francis
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The Evolution Theory, Vol. 1 of 2
Weismann, August
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Taboo and genetics : $b A study of the biological, sociological and psychological foundation of the family
Knight, Melvin M. (Melvin Moses) & Blanchard, Phyllis & Peters, Iva Lowther
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The Minds and Manners of Wild Animals: A Book of Personal Observations
Hornaday, William T. (William Temple)
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Fossil plants, Vol. 2 : $b A text-book for students of botany and geology
Seward, A. C. (Albert Charles)
809 Gutenberg downloadsen2022Difficulty 63 (Academic)
The History of the European Fauna
Scharff, R. F. (Robert Francis)
809 Gutenberg downloadsen2010Difficulty 61 (Academic)
The Wonders of Life: A Popular Study of Biological Philosophy
Haeckel, Ernst
809 Gutenberg downloadsen2014Difficulty 68 (Academic)
The Variation of Animals and Plants Under Domestication, Volume II (of 2)
Darwin, Charles
801 Gutenberg downloadsen2009Difficulty 73 (Expert)
Metabolic Adaptation to Climate and Distribution of the Raccoon Procyon Lotor and Other Procyonidae
Mugaas, John N. & Mahlke-Johnson, Kathleen P. & Seidensticker, John
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Mr. Ray's travels, Vol. 2 : $b A collection of curious travels and voyages. Containing Dr Leonhart Rauwolf's journey into the eastern countries, viz. Syria, Palestine, or the Holy Land, Armenia, Mesopotamia, Assyria, Chaldea, &c., translated from the Original High Dutch, by Nicholas Staphorst. And also, travels into Greece, Asia minor, Egypt, Arabia felix, Petræa, Ethiopia, the Red Sea, &c. Collected from the observations of Mons. Belon, Prosper Alpinus, Dr. Huntington, Mr. Vernon, Sir George Wheeler, Dr. Smith, Mr. Greaves, and others. To which are added three catalogues of such trees, shrubs, and herbs, as grow in the Levant. By the Rev. John Ray, F.R.S.
Ray, John & Rauwolf, Leonhard
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Memoirs of the Distinguished Men of Science of Great Britain Living in the Years 1807-8
Walker, William
798 Gutenberg downloadsen2018Difficulty 61 (Academic)
The Chemistry of Plant Life
Thatcher, Roscoe Wilfred
796 Gutenberg downloadsen2010Difficulty 88 (Specialist)
Eleanor Ormerod, LL. D., Economic Entomologist : Autobiography and Correspondence
Ormerod, Eleanor A. (Eleanor Anne)
793 Gutenberg downloadsen2020Difficulty 76 (Expert)
The Chautauquan, Vol. 04, October 1883
Chautauqua Literary and Scientific Circle & Chautauqua Institution
792 Gutenberg downloadsen2016Difficulty 50 (College)
The Human Side of Animals
Dixon, Royal
791 Gutenberg downloadsen2006Difficulty 58 (Graduate)
The Nests and Eggs of Indian Birds, Volume 1
Hume, Allan Octavian
791 Gutenberg downloadsen2004Difficulty 49 (College)
Vestiges of the Natural History of Creation
Chambers, Robert
790 Gutenberg downloadsen2004Difficulty 66 (Academic)
The Beaked Whales of the Family Ziphiidae An Account of the Beaked Whales of the Family Ziphiidae in the Collection of the United States Museum...
True, Frederick W. (Frederick William)
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A Natural History for Young People: Our Animal Friends in Their Native Homes including mammals, birds and fishes
Humphreys, Phebe Westcott
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The Geological History of Plants
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Essays Upon Heredity and Kindred Biological Problems Authorised Translation
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Unknown
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Science & Education: Essays
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782 Gutenberg downloadsen2004Difficulty 72 (Expert)
The Effects of Cross & Self-Fertilisation in the Vegetable Kingdom
Darwin, Charles
782 Gutenberg downloadsen2003Difficulty 61 (Academic)
The Appendages, Anatomy, and Relationships of Trilobites
Raymond, Percy E. (Percy Edward)
780 Gutenberg downloadsen2012Difficulty 67 (Academic)
Creierul, O Enigma Descifrata
Moisa, Dorin Teodor
778 Gutenberg downloadsro2004
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Maxwell, J. (Joseph)
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An Introduction to the History of Science
Libby, Walter
777 Gutenberg downloadsen2012Difficulty 62 (Academic)
Essays: Scientific, Political, & Speculative; Vol. 1 of 3 Library Edition (1891), Containing Seven Essays not before Republished, and Various other Additions.
Spencer, Herbert
777 Gutenberg downloadsen2009Difficulty 67 (Academic)
More Hunting Wasps
Fabre, Jean-Henri
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Letters of Asa Gray; Vol. 1
Gray, Asa
774 Gutenberg downloadsen2017Difficulty 49 (College)
Index of the Project Gutenberg Works of Charles Darwin
Darwin, Charles
772 Gutenberg downloadsen2019Difficulty 88 (Specialist)
An Australian Bird Book: A Pocket Book for Field Use
Leach, John Albert
766 Gutenberg downloadsen2010Difficulty 51 (Graduate)
The History of Creation, Vol. 2 (of 2) Or the Development of the Earth and its Inhabitants by the Action of Natural Causes
Haeckel, Ernst
766 Gutenberg downloadsen2012Difficulty 61 (Academic)
Botany for Ladies or, A Popular Introduction to the Natural System of Plants, According to the Classification of De Candolle.
Loudon, Mrs. (Jane)
764 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Monism as Connecting Religion and Science A Man of Science
Haeckel, Ernst
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763 Gutenberg downloadsen2022Difficulty 61 (Academic)
Trees of the Northern United States Their Study, Description and Determination
Apgar, A. C. (Austin Craig)
762 Gutenberg downloadsen2009Difficulty 53 (Graduate)
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760 Gutenberg downloadsen2011Difficulty 62 (Academic)
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Slack, Henry James
759 Gutenberg downloadsen2011Difficulty 74 (Expert)
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Bagehot, Walter
759 Gutenberg downloadsen2003Difficulty 64 (Academic)
The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants
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Collected Essays, Volume V Science and Christian Tradition: Essays
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756 Gutenberg downloadsen2005Difficulty 64 (Academic)
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755 Gutenberg downloadsen2015Difficulty 57 (Graduate)
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753 Gutenberg downloadsen2011Difficulty 60 (Graduate)
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752 Gutenberg downloadsen2004Difficulty 64 (Academic)
Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)
Burkett, Ray D.
751 Gutenberg downloadsen2011Difficulty 63 (Academic)
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Cassell's Natural History, Vol. 3 (of 6)
Unknown
750 Gutenberg downloadsen2020Difficulty 100 (Quantum Electrodynamics)
Proserpina, Volume 1 Studies of Wayside Flowers, While the Air was Yet Pure Among the Alps and in the Scotland and England Which My Father Knew
Ruskin, John
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Swainson, William
749 Gutenberg downloadsen2012Difficulty 64 (Academic)
British Pomology Or, the History, Description, Classification, and Synonymes, of the Fruits and Fruit Trees of Great Britain
Hogg, Robert
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Boulenger, George Albert
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The Organism as a Whole, from a Physicochemical Viewpoint
Loeb, Jacques
747 Gutenberg downloadsen2014Difficulty 68 (Academic)
Appletons' Popular Science Monthly, July 1899 Volume LV, No. 3, July 1899
Various
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The cherries of New York
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746 Gutenberg downloadsen2014Difficulty 67 (Academic)
Cassell's book of birds; vol. 3
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744 Gutenberg downloadsen2019Difficulty 62 (Academic)
The Glands Regulating Personality A Study of the Glands of Internal Secretion in Relation to the Types of Human Nature
Berman, Louis
743 Gutenberg downloadsen2003Difficulty 58 (Graduate)
The Chautauquan, Vol. 05, June 1885, No. 9
Chautauqua Literary and Scientific Circle & Chautauqua Institution
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Observations of a Naturalist in the Pacific Between 1896 and 1899, Volume 2 Plant-Dispersal
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An Inquiry into the Causes and Effects of the Variolae Vaccinae A Disease Discovered in Some of the Western Counties of England, Particularly Gloucestershire, and Known by the Name of the Cow Pox
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Life and Letters of Thomas Henry Huxley — Volume 1
Huxley, Thomas Henry
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An introduction to the study of fishes
Günther, Albert C. L. G. (Albert Carl Ludwig Gotthilf)
736 Gutenberg downloadsen2023Difficulty 74 (Expert)
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735 Gutenberg downloadsen2017Difficulty 56 (Graduate)
Birds from North Borneo University of Kansas Publications, Museum of Natural History, Volume 17, No. 8, pp. 377-433, October 27, 1966
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Philosophical transactions, Vol. L. Part I. For the year 1757. Giving some account of the present undertakings, studies, and labours, of the ingenious, in many considerable parts of the world.
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The Lobster Fishery of Maine Bulletin of the United States Fish Commission, Vol. 19, Pages 241-265, 1899
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720 Gutenberg downloadsen2004Difficulty 63 (Academic)
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717 Gutenberg downloadsen2023Difficulty 72 (Expert)
Buffon's Natural History, Volume 01 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Mineral, &c. &c
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Unknown
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713 Gutenberg downloadsen2014Difficulty 62 (Academic)
Response in the Living and Non-Living
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713 Gutenberg downloadsen2006Difficulty 65 (Academic)
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Michaux, André & Harris, Thaddeus Mason & Michaux, François André
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712 Gutenberg downloadsfr2011
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711 Gutenberg downloadsen2024Difficulty 67 (Academic)
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Cassell's book of birds; vol. 2
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706 Gutenberg downloadsen2008Difficulty 63 (Academic)
Appletons' Popular Science Monthly, December 1899 Vol. LVI, November, 1899 to April, 1900
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Autobiography and Selected Essays
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705 Gutenberg downloadsen2006Difficulty 54 (Graduate)
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Unknown
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The Life-Story of Insects
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704 Gutenberg downloadsen2005Difficulty 57 (Graduate)
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704 Gutenberg downloadsen2024Difficulty 65 (Academic)
On Molecular and Microscopic Science, Volume 2 (of 2)
Somerville, Mary
703 Gutenberg downloadsen2018Difficulty 58 (Graduate)
Darwiniana : Essays — Volume 02
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702 Gutenberg downloadsen2004Difficulty 68 (Academic)
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700 Gutenberg downloadsen2012Difficulty 50 (College)
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699 Gutenberg downloadsen2009Difficulty 64 (Academic)
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698 Gutenberg downloadsen2006Difficulty 59 (Graduate)
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697 Gutenberg downloadsen2013Difficulty 69 (Academic)
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694 Gutenberg downloadsen2022Difficulty 69 (Academic)
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692 Gutenberg downloadsen2014Difficulty 69 (Academic)
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691 Gutenberg downloadsen2003Difficulty 62 (Academic)
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Bichat, Xavier
690 Gutenberg downloadsen2017Difficulty 67 (Academic)
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687 Gutenberg downloadsen2007Difficulty 63 (Academic)
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687 Gutenberg downloadsen2020Difficulty 73 (Expert)
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686 Gutenberg downloadsen2012Difficulty 62 (Academic)
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The Story of Evolution
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682 Gutenberg downloadsen1997Difficulty 56 (Graduate)
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681 Gutenberg downloadsen2022Difficulty 53 (Graduate)
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679 Gutenberg downloadsen2013Difficulty 70 (Academic)
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Unknown
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675 Gutenberg downloadsen2015Difficulty 55 (Graduate)
Significant Achievements in Space Bioscience 1958-1964
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Duellman, William Edward
671 Gutenberg downloadsen2011Difficulty 63 (Academic)
Intelligence in Plants and Animals Being a New Edition of the Author's Privately Issued "Soul and Immortality."
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671 Gutenberg downloadsen2021Difficulty 71 (Expert)
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Linnean Society of London
671 Gutenberg downloadsen2014Difficulty 61 (Academic)
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The Movements and Habits of Climbing Plants
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Buffon's Natural History. Volume 06 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
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The Nursery-Book: A Complete Guide to the Multiplication and Pollination of Plants
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661 Gutenberg downloadsen2019Difficulty 59 (Graduate)
Scientific American Supplement, No. 598, June 18, 1887
Various
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Darwiniana; Essays and Reviews Pertaining to Darwinism
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659 Gutenberg downloadsen2004Difficulty 69 (Academic)
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657 Gutenberg downloadsen2013Difficulty 64 (Academic)
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Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz
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Alfred Russel Wallace: Letters and Reminiscences, Vol. 2
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656 Gutenberg downloadsen2005Difficulty 69 (Academic)
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656 Gutenberg downloadsen2014Difficulty 64 (Academic)
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655 Gutenberg downloadsen2013Difficulty 66 (Academic)
Studies in the Theory of Descent (Volumes 1 and 2)
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655 Gutenberg downloadsen2015Difficulty 68 (Academic)
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654 Gutenberg downloadsen2014Difficulty 60 (Graduate)
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653 Gutenberg downloadsen2009Difficulty 41 (College)
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651 Gutenberg downloadsen2012Difficulty 85 (Specialist)
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The Natural Philosophy of Love
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The Popular Science Monthly, September, 1900 Vol. 57, May, 1900 to October, 1900
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Life Movements in Plants, Volume II
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647 Gutenberg downloadsen2012Difficulty 73 (Expert)
Scientific American, Vol. XXXIX.No. 6. [New Series.], August 10, 1878
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646 Gutenberg downloadsen2013Difficulty 67 (Academic)
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645 Gutenberg downloadsen2022Difficulty 51 (Graduate)
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642 Gutenberg downloadsen2007Difficulty 52 (Graduate)
The Chautauquan, Vol. 05, April 1885
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Useful Knowledge: Volume 2. Vegetables Or, a familiar account of the various productions of nature
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640 Gutenberg downloadsen2010Difficulty 63 (Academic)
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627 Gutenberg downloadsen2014Difficulty 61 (Academic)
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626 Gutenberg downloadsen2006Difficulty 53 (Graduate)
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625 Gutenberg downloadsen2023Difficulty 83 (Specialist)
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Appletons' Popular Science Monthly, March 1899 Volume LIV, No. 5, March 1899
Various
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618 Gutenberg downloadsen2004Difficulty 55 (Graduate)
The Taleef Shereef; Or, Indian Materia Medica
Unknown
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Dragons of the Air: An Account of Extinct Flying Reptiles
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616 Gutenberg downloadsen2011Difficulty 54 (Graduate)
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616 Gutenberg downloadsen2021Difficulty 70 (Academic)
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612 Gutenberg downloadsen2013Difficulty 66 (Academic)
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610 Gutenberg downloadsen1996Difficulty 57 (Graduate)
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609 Gutenberg downloadsen2023Difficulty 65 (Academic)
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607 Gutenberg downloadsen2011Difficulty 65 (Academic)
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607 Gutenberg downloadsen2013Difficulty 56 (Graduate)
Appletons' Popular Science Monthly, March 1900 Vol. 56, Nov. 1899 to April, 1900
Various
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605 Gutenberg downloadsen2022Difficulty 54 (Graduate)
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604 Gutenberg downloadsen2013Difficulty 60 (Graduate)
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603 Gutenberg downloadsen2010Difficulty 66 (Academic)
Aspects of nature, in different lands and different climates (Vol. 2 of 2) with scientific elucidations
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601 Gutenberg downloadsen2022Difficulty 72 (Expert)
Secrets of Earth and Sea
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601 Gutenberg downloadsen2016Difficulty 53 (Graduate)
An essay towards a natural history of serpents
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598 Gutenberg downloadsen2023Difficulty 49 (College)
Buffon's Natural History. Volume 04 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
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597 Gutenberg downloadsen2014Difficulty 56 (Graduate)
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Michelet, Jules
597 Gutenberg downloadsen2013Difficulty 61 (Academic)
A Guide for the Study of Animals
Whitney, Worrallo & Lucas, Frederic Colby & Shinn, Harold Brough & Smallwood, Mabel Elizabeth
596 Gutenberg downloadsen2011Difficulty 48 (College)
A Hand-book to the Primates, Volume 2 (of 2)
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595 Gutenberg downloadsen2013Difficulty 54 (Graduate)
Buffon's Natural History. Volume 10 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
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595 Gutenberg downloadsen2014Difficulty 61 (Academic)
Life: Its True Genesis
Flaccus, Horatius
594 Gutenberg downloadsen2005Difficulty 60 (Graduate)
Scientific American Supplement, No. 388, June 9, 1883
Various
594 Gutenberg downloadsen2005Difficulty 56 (Graduate)
Luck, or Cunning, as the Main Means of Organic Modification
Butler, Samuel
593 Gutenberg downloadsen2004Difficulty 61 (Academic)
Philosophical transactions, Vol. L. Part II. For the year 1758. Giving some account of the present undertakings, studies, and labours, of the ingenious, in many considerable parts of the world.
Various & Royal Society (Great Britain)
593 Gutenberg downloadsen2022Difficulty 49 (College)
Garden Pests in New Zealand A Popular Manual for Practical Gardeners, Farmers and Schools
Miller, David
592 Gutenberg downloadsen2014Difficulty 71 (Expert)
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Saleeby, C. W. (Caleb Williams)
592 Gutenberg downloadsen2006Difficulty 59 (Graduate)
Stories of the Universe: Animal Life
Lindsay, B.
591 Gutenberg downloadsen2012Difficulty 51 (Graduate)
The Evolution Theory, Vol. 2 of 2
Weismann, August
591 Gutenberg downloadsen2021Difficulty 64 (Academic)
An Introduction to Entomology: Vol. 1 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
590 Gutenberg downloadsen2013Difficulty 74 (Expert)
Buffon's Natural History. Volume 09 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
Buffon, Georges Louis Leclerc, comte de
590 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Lameness of the Horse Veterinary Practitioners' Series, No. 1
Lacroix, John Victor
590 Gutenberg downloadsen2005Difficulty 65 (Academic)
The Biology, Physiology and Sociology of Reproduction Also Sexual Hygiene with Special Reference to the Male
Hall, Winfield Scott
590 Gutenberg downloadsen2008Difficulty 56 (Graduate)
The Vivisectors' Directory Being a list of the licensed vivisectors in the United Kingdom, together with the leading physiologists in foreign laboratories
Unknown
590 Gutenberg downloadsen2017Difficulty 61 (Academic)
Creation and Its Records A Brief Statement of Christian Belief with Reference to Modern Facts and Ancient Scripture
Baden-Powell, B. H. (Baden Henry)
588 Gutenberg downloadsen2004Difficulty 62 (Academic)
Über die Entstehung der Arten im Thier- und Pflanzen-Reich durch natürliche Züchtung
Darwin, Charles
588 Gutenberg downloadsde2022
Aphorisms and Reflections from the works of T. H. Huxley
Huxley, Thomas Henry
587 Gutenberg downloadsen2011Difficulty 59 (Graduate)
Fishing Grounds of the Gulf of Maine
Rich, Walter H. (Walter Herbert)
587 Gutenberg downloadsen2005Difficulty 57 (Graduate)
Popular Books on Natural Science For Practical Use in Every Household, for Readers of All Classes
Bernstein, Aaron David
586 Gutenberg downloadsen2011Difficulty 50 (College)
Antarctic Penguins: A Study of Their Social Habits
Levick, G. Murray (George Murray)
585 Gutenberg downloadsen2011Difficulty 50 (College)
Abstracts of Papers Read at the First International Eugenics Congress University of London, July, 1912
International Eugenics Congress (1st : 1912 : London)
584 Gutenberg downloadsen2014Difficulty 65 (Academic)
Studies on Fermentation The diseases of beer, their causes, and the means of preventing them
Pasteur, Louis
584 Gutenberg downloadsen2020Difficulty 55 (Graduate)
An Introduction to Nature-study
Stenhouse, E. (Ernest)
583 Gutenberg downloadsen2020Difficulty 42 (College)
The Genetic Effects of Radiation
Asimov, Isaac & Dobzhansky, Theodosius
583 Gutenberg downloadsen2017Difficulty 59 (Graduate)
Outlines of Lessons in Botany, Part I; from Seed to Leaf For the Use of Teachers, or Mothers Studying with Their Children
Moore, Jane Newell
582 Gutenberg downloadsen2004Difficulty 42 (College)
A treatise on the esculent funguses of England containing an account of their classical history, uses, characters, development, structure, nutritious properties, modes of cooking and preserving, etc.
Badham, David
581 Gutenberg downloadsen2019Difficulty 68 (Academic)
Noteworthy Records of Bats From Nicaragua, with a Checklist of the Chiropteran Fauna of the Country
Jones, J. Knox & Smith, James Dale & Turner, Ronald W.
581 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Physiology
Foster, M. (Michael), Sir
581 Gutenberg downloadsen2016Difficulty 39 (High School)
The Courtship of Animals
Pycraft, W. P. (William Plane)
581 Gutenberg downloadsen2019Difficulty 66 (Academic)
The Popular Science Monthly, October, 1900 Vol. 57, May, 1900 to October, 1900
Various
581 Gutenberg downloadsen2014Difficulty 75 (Expert)
Parallel Paths: A Study in Biology, Ethics, and Art
Rolleston, T. W. (Thomas William)
580 Gutenberg downloadsen2014Difficulty 69 (Academic)
Common Diseases of Farm Animals
Craig, Robert Alexander
578 Gutenberg downloadsen2005Difficulty 55 (Graduate)
The birds of Jamaica
Gosse, Philip Henry
578 Gutenberg downloadsen2024Difficulty 63 (Academic)
Bacteria Especially as they are related to the economy of nature, to industrial processes, and to the public health
Newman, George, Sir
577 Gutenberg downloadsen2015Difficulty 66 (Academic)
Appletons' Popular Science Monthly, February 1900 Vol. 56, November, 1899 to April, 1900
Various
576 Gutenberg downloadsen2014Difficulty 62 (Academic)
The Elements of Agriculture A Book for Young Farmers, with Questions Prepared for the Use of Schools
Waring, George E. (George Edwin)
574 Gutenberg downloadsen2010Difficulty 53 (Graduate)
European Fungus Flora: Agaricaceae
Massee, George
573 Gutenberg downloadsen2010Difficulty 48 (College)
A Synopsis of Neotropical Hylid Frogs, Genus Osteocephalus
Trueb, Linda & Duellman, William Edward
572 Gutenberg downloadsen2011Difficulty 67 (Academic)
Birds of Guernsey (1879) And the Neighbouring Islands: Alderney, Sark, Jethou, Herm; Being a Small Contribution to the Ornitholony of the Channel Islands
Smith, Cecil
572 Gutenberg downloadsen2004Difficulty 65 (Academic)
Our Summer Migrants An Account of the Migratory Birds Which Pass the Summer in the British Islands.
Harting, James Edmund
572 Gutenberg downloadsen2019Difficulty 57 (Graduate)
The Foot-prints of the Creator : $b or, The Asterolepis of Stromness
Miller, Hugh
572 Gutenberg downloadsen2022Difficulty 66 (Academic)
Animal Locomotion; or, walking, swimming, and flying With a dissertation on aëronautics
Pettigrew, James Bell
571 Gutenberg downloadsen2018Difficulty 66 (Academic)
History of Embalming and of Preparations in Anatomy, Pathology, and Natural History; Including an Account of a New Process for Embalming
Gannal, J.-N. (Jean-Nicolas)
571 Gutenberg downloadsen2015Difficulty 78 (Expert)
Buffon's Natural History, Volume 03 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c.
Buffon, Georges Louis Leclerc, comte de
570 Gutenberg downloadsen2014Difficulty 68 (Academic)
Mimicry in Butterflies
Punnett, Reginald Crundall
570 Gutenberg downloadsen2013Difficulty 62 (Academic)
Territory in Bird Life
Howard, Henry Eliot
570 Gutenberg downloadsen2010Difficulty 62 (Academic)
The Botanical Magazine, Vol. 01 Or, Flower-Garden Displayed
Curtis, William
570 Gutenberg downloadsen2005Difficulty 57 (Graduate)
The Evolutionist at Large
Allen, Grant
569 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Versuche über Pflanzenhybriden
Mendel, Gregor
569 Gutenberg downloadsde2012
Text book of veterinary medicine, Volume 4 (of 5)
Law, James
568 Gutenberg downloadsen2024Difficulty 69 (Academic)
The Honey-Bee: Its Natural History, Physiology and Management
Bevan, Edward
568 Gutenberg downloadsen2022Difficulty 63 (Academic)
Dactylography; Or, The Study of Finger-prints
Faulds, Henry
566 Gutenberg downloadsen2015Difficulty 59 (Graduate)
Research methods in ecology
Clements, Frederic E. (Frederic Edward)
566 Gutenberg downloadsen2024Difficulty 50 (College)
The Geographical Distribution of Animals, Volume 2 With a study of the relations of living and extinct faunas as elucidating the past changes of the Earth's surface
Wallace, Alfred Russel
566 Gutenberg downloadsen2018Difficulty 64 (Academic)
The Fishing Industry
Gibbs, William E. (William Edward)
565 Gutenberg downloadsen2016Difficulty 54 (Graduate)
Buffon's Natural History. Volume 05 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
Buffon, Georges Louis Leclerc, comte de
564 Gutenberg downloadsen2014Difficulty 65 (Academic)
An Account of the Insects Noxious to Agriculture and Plants in New Zealand The Scale Insects (Coccididae)
Maskell, William Miles
563 Gutenberg downloadsen2015Difficulty 53 (Graduate)
Nature readers : $b Sea-side and way-side. No. 4
Wright, Julia McNair
563 Gutenberg downloadsen2023Difficulty 45 (College)
The Pecan and its Culture
Hume, H. Harold (Hardrada Harold)
563 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Journal of a tour in Marocco and the Great Atlas
Hooker, Joseph Dalton & Ball, John
562 Gutenberg downloadsen2023Difficulty 66 (Academic)
Scientific American Supplement, No. 810, July 11, 1891
Various
562 Gutenberg downloadsen2005Difficulty 51 (Graduate)
The Life and Love of the Insect
Fabre, Jean-Henri
562 Gutenberg downloadsen2022Difficulty 50 (College)
Appletons' Popular Science Monthly, November 1898 Volume 54, November 1898
Various
559 Gutenberg downloadsen2013Difficulty 60 (Graduate)
The Meaning of Evolution
Schmucker, Samuel Christian
558 Gutenberg downloadsen2009Difficulty 51 (Graduate)
On the Relations of Man to the Lower Animals
Huxley, Thomas Henry
557 Gutenberg downloadsen2001Difficulty 72 (Expert)
Variation in the Muscles and Nerves of the Leg in Two Genera of Grouse (Tympanuchus and Pedioecetes)
Holmes, E. Bruce
557 Gutenberg downloadsen2013Difficulty 55 (Graduate)
Popular Lectures on Zoonomia Or The Laws of Animal Life, in Health and Disease
Garnett, Thomas
556 Gutenberg downloadsen2009Difficulty 59 (Graduate)
The Life of the Scorpion
Fabre, Jean-Henri
556 Gutenberg downloadsen2021Difficulty 49 (College)
Mental Radio
Sinclair, Upton
555 Gutenberg downloadsen2020Difficulty 52 (Graduate)
The Dinosaur Quarry. Dinosaur National Monument, Colorado-Utah
Good, John M. (John Maxwell) & Stucker, Gilbert F. & White, Theodore Elmer
555 Gutenberg downloadsen2015Difficulty 54 (Graduate)
Science in Arcady
Allen, Grant
554 Gutenberg downloadsen2005Difficulty 63 (Academic)
Discourses: Biological & Geological Essays
Huxley, Thomas Henry
553 Gutenberg downloadsen2003Difficulty 61 (Academic)
Life Movements in Plants, Volume I
Bose, Jagadis Chandra
553 Gutenberg downloadsen2015Difficulty 69 (Academic)
Vertebrates from the Barrier Island of Tamaulipas, México
Selander, Robert K. & Johnston, Richard F. & Raun, Gerald G. & Wilks, B. J.
553 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Biology and Its Makers With Portraits and Other Illustrations
Locy, William A. (William Albert)
552 Gutenberg downloadsen2019Difficulty 56 (Graduate)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, II. Band Von Galilei bis zur Mitte des XVIII. Jahrhunderts
Dannemann, Friedrich
552 Gutenberg downloadsde2017
Seed Dispersal
Beal, W. J. (William James)
552 Gutenberg downloadsen2008Difficulty 46 (College)
The Making of Species
Dewar, Douglas & Finn, Frank
552 Gutenberg downloadsen2013Difficulty 72 (Expert)
Illustrations of Exotic Entomology, Volume 2
Drury, Dru
551 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Lectures on Evolution Essay #3 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
551 Gutenberg downloadsen2001Difficulty 69 (Academic)
The Academic Gregories
Stewart, Agnes Grainger
551 Gutenberg downloadsen2016Difficulty 59 (Graduate)
Freshwater Sponges, Hydroids & Polyzoa
Annandale, Nelson
550 Gutenberg downloadsen2011Difficulty 61 (Academic)
Outlines of dairy bacteriology, 10th edition A concise manual for the use of students in dairying
Russell, H. L. (Harry Luman) & Hastings, E. G. (Edwin George)
550 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Pearls & Parasites
Shipley, A. E. (Arthur Everett), Sir
550 Gutenberg downloadsen2016Difficulty 55 (Graduate)
The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity
Conn, H. W. (Herbert William)
550 Gutenberg downloadsen2005Difficulty 58 (Graduate)
Aphorisms and Reflections from the Works of T. H. Huxley
Huxley, Thomas Henry
549 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Jelly-Fish, Star-Fish, and Sea-Urchins: Being a Research on Primitive Nervous Systems
Romanes, George John
548 Gutenberg downloadsen2014Difficulty 64 (Academic)
Was Man Created?
Mott, Henry A. (Henry Augustus)
548 Gutenberg downloadsen2009Difficulty 66 (Academic)
Buffon's Natural History. Volume 08 (of 10) Containing a Theory of the Earth, a General History of Man, of the Brute Creation, and of Vegetables, Minerals, &c. &c
Buffon, Georges Louis Leclerc, comte de
547 Gutenberg downloadsen2014Difficulty 61 (Academic)
The botanist's repository for new and rare plants; vol. 01 & 02 [of 10]
Andrews, Henry Cranke, active 1799-1828
547 Gutenberg downloadsen2023Difficulty 57 (Graduate)
Appletons' Popular Science Monthly, February 1899 Volume LIV, No. 4, February 1899
Various
545 Gutenberg downloadsen2013Difficulty 57 (Graduate)
History of biology
Miall, L. C. (Louis Compton)
544 Gutenberg downloadsen2018Difficulty 61 (Academic)
A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America)
Wellman, John
543 Gutenberg downloadsen2011Difficulty 59 (Graduate)
De Canibus Britannicis: Of Englishe Dogges
Caius, John
543 Gutenberg downloadsen2008Difficulty 81 (Specialist)
Haeckel : $b his life and work
Bölsche, Wilhelm
543 Gutenberg downloadsen2023Difficulty 53 (Graduate)
The History of Insects
Unknown
543 Gutenberg downloadsen2004Difficulty 55 (Graduate)
The Botanical Magazine, Vol. 02 Or, Flower-Garden Displayed
Curtis, William
542 Gutenberg downloadsen2006Difficulty 57 (Graduate)
The Breeding Birds of Kansas
Johnston, Richard F.
541 Gutenberg downloadsen2011Difficulty 74 (Expert)
The human species
Quatrefages, A. de (Armand de)
541 Gutenberg downloadsen2023Difficulty 56 (Graduate)
Souvenirs entomologiques - Livre I Étude sur l'instinct et les moeurs des insectes
Fabre, Jean-Henri
540 Gutenberg downloadsfr2005
The Lives of Celebrated Travellers, Vol. 2 (of 3)
St. John, James Augustus
539 Gutenberg downloadsen2021Difficulty 90 (Specialist)
Les énigmes de l'Univers
Haeckel, Ernst
538 Gutenberg downloadsfr2012
Scientific American Supplement, No. 561, October 2, 1886
Various
538 Gutenberg downloadsen2005Difficulty 50 (College)
Facts and Arguments for Darwin
Müller, Fritz
537 Gutenberg downloadsen2004Difficulty 70 (Academic)
Forest Trees of Illinois: How to Know Them
Fuller, George D. (George Damon) & Mattoon, Wilbur R. (Wilbur Reed) & Miller, Robert B. (Robert Barclay) & Nuuttila, E. E.
537 Gutenberg downloadsen2011Difficulty 50 (College)
The Flea
Russell, Harold
537 Gutenberg downloadsen2014Difficulty 53 (Graduate)
The Monist, Vol. 1, 1890-1891 : $b A quarterly magazine
Various
537 Gutenberg downloadsen2018Difficulty 64 (Academic)
Charles Darwin and the Theory of Natural Selection
Poulton, Edward Bagnall, Sir
536 Gutenberg downloadsen2021Difficulty 60 (Graduate)
Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901
Calkins, Gary N. (Gary Nathan)
536 Gutenberg downloadsen2006Difficulty 56 (Graduate)
Seaside Studies in Natural History. Marine Animals of Massachusetts Bay. Radiates.
Agassiz, Elizabeth Cabot Cary & Agassiz, Alexander
536 Gutenberg downloadsen2011Difficulty 52 (Graduate)
The anatomy of the domestic fowl
Kaupp, B. F. (Benjamin Franklyn)
536 Gutenberg downloadsen2023Difficulty 65 (Academic)
The Last Link: Our Present Knowledge of the Descent of Man
Haeckel, Ernst
536 Gutenberg downloadsen2013Difficulty 63 (Academic)
Field, Forest and Farm Things interesting to young nature-lovers, including some matters of moment to gardeners and fruit-growers
Fabre, Jean-Henri
535 Gutenberg downloadsen2022Difficulty 54 (Graduate)
From an Easy Chair
Lankester, E. Ray (Edwin Ray), Sir
535 Gutenberg downloadsen2020Difficulty 50 (College)
An anatomical disquisition on the motion of the heart & blood in animals
Harvey, William
533 Gutenberg downloadsen2022Difficulty 62 (Academic)
Disease and Its Causes
Councilman, W. T. (William Thomas)
533 Gutenberg downloadsen2005Difficulty 57 (Graduate)
Mr. Gladstone and Genesis Essay #5 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
533 Gutenberg downloadsen2001Difficulty 59 (Graduate)
The Ornithosauria An elementary study of the bones of Pterodactyles made from fossil remains found in the Cambridge Upper Greensand, and arranged in the Woodwardian Museum of the University of Cambridge
Seeley, H. G. (Harry Govier)
533 Gutenberg downloadsen2016Difficulty 58 (Graduate)
Scientific American Supplement, No. 595, May 28, 1887
Various
532 Gutenberg downloadsen2004Difficulty 52 (Graduate)
Scientific American Supplement, No. 643, April 28, 1888
Various
532 Gutenberg downloadsen2005Difficulty 65 (Academic)
The Principles of Biology, Volume 2 (of 2)
Spencer, Herbert
532 Gutenberg downloadsen2022Difficulty 63 (Academic)
Grundzüge der Paläontologie (Paläozoologie). 2. Abteilung: Vertebrata.
Zittel, Karl Alfred von
531 Gutenberg downloadsde2025
Nouveaux souvenirs entomologiques - Livre II Étude sur l'instinct et les moeurs des insectes
Fabre, Jean-Henri
531 Gutenberg downloadsfr2006
The Biological Problem of To-day: Preformation Or Epigenesis? The Basis of a Theory of Organic Development
Hertwig, Oscar
531 Gutenberg downloadsen2011Difficulty 67 (Academic)
An elementary manual of New Zealand entomology : $b being an introduction to the study of our native insects
Hudson, G. V. (George Vernon)
529 Gutenberg downloadsen2013Difficulty 54 (Graduate)
The Adductor Muscles of the Jaw In Some Primitive Reptiles
Fox, Richard C.
529 Gutenberg downloadsen2009Difficulty 66 (Academic)
The Physical Basis of Mind Being the Second Series of Problems of Life and Mind.
Lewes, George Henry
528 Gutenberg downloadsen2019Difficulty 70 (Academic)
A Synopsis of the North American Lagomorpha
Hall, E. Raymond (Eugene Raymond)
527 Gutenberg downloadsen2010Difficulty 53 (Graduate)
The book of antelopes, vol. 3 (of 4)
Sclater, Philip Lutley & Thomas, Oldfield
527 Gutenberg downloadsen2023Difficulty 45 (College)
Wild Animals of North America Intimate Studies of Big and Little Creatures of the Mammal Kingdom
Nelson, Edward William
527 Gutenberg downloadsen2019Difficulty 52 (Graduate)
De afstamming van den mensch en de seksueele teeltkeus, deel 1 (van 2)
Darwin, Charles
526 Gutenberg downloadsnl2022
A Critique of the Theory of Evolution
Morgan, Thomas Hunt
525 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Essays of a Biologist
Huxley, Julian
525 Gutenberg downloadsen2021Difficulty 66 (Academic)
Q. E. D., or New Light on the Doctrine of Creation
Price, George McCready
525 Gutenberg downloadsen2004Difficulty 67 (Academic)
Ideen zu einer Physiognomik der Gewächse
Humboldt, Alexander von
524 Gutenberg downloadsde2007
Scientific American Supplement, No. 363, December 16, 1882
Various
524 Gutenberg downloadsen2005Difficulty 62 (Academic)
The Diatomaceæ of Philadelphia and Vicinity
Boyer, Charles S. (Charles Sumner)
524 Gutenberg downloadsen2014Difficulty 67 (Academic)
The flowering plants of South Africa; vol. 3
Pole Evans, I. B. (Illtyd Buller)
523 Gutenberg downloadsen2021Difficulty 52 (Graduate)
Mammals of Northwestern South Dakota
Andersen, Kenneth W. & Jones, J. Knox
522 Gutenberg downloadsen2010Difficulty 50 (College)
Scientific American Supplement, No. 520, December 19, 1885
Various
522 Gutenberg downloadsen2004Difficulty 56 (Graduate)
Studies in the Theory of Descent, Volume I
Weismann, August
522 Gutenberg downloadsen2015Difficulty 68 (Academic)
Darwin
Bradford, Gamaliel
521 Gutenberg downloadsen2023Difficulty 60 (Graduate)
Ecological Observations on the Woodrat, Neotoma floridana
Fitch, Henry S. (Henry Sheldon) & Rainey, Dennis G.
521 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Gorillas & Chimpanzees
Garner, R. L. (Richard Lynch)
521 Gutenberg downloadsen2013Difficulty 51 (Graduate)
Wasps, Social and Solitary
Peckham, George W. (George Williams) & Peckham, E. G. (Elizabeth Gifford)
521 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Grasses : $b A handbook for use in the field and laboratory
Ward, H. Marshall (Harry Marshall)
520 Gutenberg downloadsen2015Difficulty 56 (Graduate)
Spiders
Warburton, Cecil
520 Gutenberg downloadsen2013Difficulty 54 (Graduate)
Text book of veterinary medicine, Volume 1 (of 5)
Law, James
520 Gutenberg downloadsen2023Difficulty 67 (Academic)
Appletons' Popular Science Monthly, January 1899 Volume LIV, No. 3, January 1899
Various
519 Gutenberg downloadsen2013Difficulty 56 (Graduate)
Introduction à l'étude de la médecine expérimentale
Bernard, Claude
519 Gutenberg downloadsfr2005
General Anatomy, Applied to Physiology and Medicine, Vol. 2 (of 3)
Bichat, Xavier
518 Gutenberg downloadsen2017Difficulty 61 (Academic)
Grundriß der menschlichen Erblichkeitslehre und Rassenhygiene (1/2) Menschliche Erblichkeitslehre
Baur, Erwin & Fischer, Eugen & Lenz, Fritz
518 Gutenberg downloadsde2015
On the phenomena of variation and geographical distribution as illustrated by the Papilionidæ of the Malayan region
Wallace, Alfred Russel
518 Gutenberg downloadsen2024Difficulty 66 (Academic)
A Review of the Middle American Tree Frogs of the Genus Ptychohyla
Duellman, William Edward
517 Gutenberg downloadsen2011Difficulty 58 (Graduate)
Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man
Benedict, Francis Gano & Carpenter, Thorne M. (Thorne Martin)
517 Gutenberg downloadsen2009Difficulty 65 (Academic)
Within the Deep Cassell's "Eyes and No Eyes" Series, Book VIII.
Smith, R. Cadwallader
517 Gutenberg downloadsen2004Difficulty 34 (High School)
The Child's Book of Nature Three parts in one
Hooker, Worthington
516 Gutenberg downloadsen2018Difficulty 36 (High School)
The romance of the animal world : $b Interesting descriptions of the strange & curious in natural history
Selous, Edmund
516 Gutenberg downloadsen2023Difficulty 63 (Academic)
A Handbook of Some South Indian Grasses
Rangachari, K. & Tadulinga Mudaliyar, C.
515 Gutenberg downloadsen2007Difficulty 50 (College)
A Treatise on the Plague and Yellow Fever With an Appendix, containing histories of the plague at Athens in the time of the Peloponnesian War; at Constantinople in the time of Justinian; at London in 1665; at Marseilles in 1720
Tytler, James
515 Gutenberg downloadsen2022Difficulty 55 (Graduate)
The Arena, Volume 18, No. 93, August, 1897
Various
515 Gutenberg downloadsen2010Difficulty 51 (Graduate)
Ancient Plants Being a Simple Account of the past Vegetation of the Earth and of the Recent Important Discoveries Made in This Realm of Nature
Stopes, Marie Carmichael
514 Gutenberg downloadsen2013Difficulty 57 (Graduate)
La simulación en la lucha por la vida
Ingenieros, José
514 Gutenberg downloadses2020
On the Reception of the 'Origin of Species'
Huxley, Thomas Henry
514 Gutenberg downloadsen2000Difficulty 66 (Academic)
Yeast
Huxley, Thomas Henry
514 Gutenberg downloadsen2001Difficulty 66 (Academic)
The history of a mouthful of bread : $b and its effect on the organization of men and animals
Macé, Jean
513 Gutenberg downloadsen2004Difficulty 49 (College)
Beginners' botany
Bailey, L. H. (Liberty Hyde)
512 Gutenberg downloadsen2024Difficulty 50 (College)
Scientific American Supplement, No. 492, June 6, 1885
Various
512 Gutenberg downloadsen2004Difficulty 53 (Graduate)
Zoological Illustrations, Volume 2 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
512 Gutenberg downloadsen2012Difficulty 62 (Academic)
A Historical Account of Useful Inventions and Scientific Discoveries Being a manual of instruction and entertainment.
Grant, George
511 Gutenberg downloadsen2016Difficulty 62 (Academic)
The Geographical Distribution of Animals, Volume 1 With a study of the relations of living and extinct faunas as elucidating the past changes of the Earth's surface
Wallace, Alfred Russel
511 Gutenberg downloadsen2018Difficulty 58 (Graduate)
Mendel's principles of heredity: A defence
Bateson, William & Mendel, Gregor
510 Gutenberg downloadsen2022Difficulty 55 (Graduate)
Het Leven der Dieren, Deel 3, Hoofdstuk 04: De Insecten
Brehm, Alfred Edmund
509 Gutenberg downloadsnl2020
Scientific American Supplement, No. 795, March 28, 1891
Various
509 Gutenberg downloadsen2004Difficulty 62 (Academic)
Speciation and Evolution of the Pygmy Mice, Genus Baiomys
Packard, Robert L. (Robert Lewis)
509 Gutenberg downloadsen2011Difficulty 64 (Academic)
A Field Study of the Kansas Ant-Eating Frog, Gastrophryne olivacea
Fitch, Henry S. (Henry Sheldon)
508 Gutenberg downloadsen2010Difficulty 55 (Graduate)
A Statistical Inquiry Into the Nature and Treatment of Epilepsy
Bennett, Alexander Hughes
508 Gutenberg downloadsen2011Difficulty 44 (College)
Life's Dawn on Earth Being the history of the oldest known fossil remains, and their relations to geological time and to the development of the animal kingdom
Dawson, John William, Sir
508 Gutenberg downloadsen2015Difficulty 58 (Graduate)
On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment
Bourguignon, Honoré
508 Gutenberg downloadsen2011Difficulty 69 (Academic)
Insects and Diseases of Trees in the South
Anonymous
507 Gutenberg downloadsen2015Difficulty 55 (Graduate)
Travels into North America, Volume 2 (of 3)
Kalm, Pehr
506 Gutenberg downloadsen2023Difficulty 47 (College)
Fathers of Biology
McRae, Charles
505 Gutenberg downloadsen2008Difficulty 64 (Academic)
The Botanical Magazine, Vol. 05 Or, Flower-Garden Displayed
Curtis, William
505 Gutenberg downloadsen2006Difficulty 57 (Graduate)
The Social Direction of Evolution: An Outline of the Science of Eugenics
Kellicott, William E. (William Erskine)
505 Gutenberg downloadsen2010Difficulty 63 (Academic)
Die Cellularpathologie in ihrer Begründung auf physiologische und pathologische Gewebelehre
Virchow, Rudolf
504 Gutenberg downloadsde2014
Inheritance of Characteristics in Domestic Fowl
Davenport, Charles Benedict
504 Gutenberg downloadsen2015Difficulty 50 (College)
On Some Fossil Remains of Man
Huxley, Thomas Henry
504 Gutenberg downloadsen2001Difficulty 60 (Graduate)
Studies in the Evolutionary Psychology of Feeling
Stanley, Hiram Miner
504 Gutenberg downloadsen2018Difficulty 62 (Academic)
The zoology of the voyage of H.M.S. Beagle [vol. 2 of 5] : $b Mammalia
Waterhouse, G. R. (George Robert)
504 Gutenberg downloadsen2022Difficulty 53 (Graduate)
The zoology of the voyage of H.M.S. Beagle [vol. 3 of 5] : $b Birds
Gould, John
504 Gutenberg downloadsen2024Difficulty 54 (Graduate)
A Taxonomic Study of the Middle American Snake, Pituophis deppei
Duellman, William Edward
503 Gutenberg downloadsen2010Difficulty 58 (Graduate)
An Experimental Translocation of the Eastern Timber Wolf
Weise, Thomas F. & Hook, Richard A. & Mech, L. David & Robinson, William Laughlin
502 Gutenberg downloadsen2011Difficulty 56 (Graduate)
The Book of Love
Mantegazza, Paolo
502 Gutenberg downloadsen2018Difficulty 72 (Expert)
Careers in Atomic Energy
McIlhenny, Loyce J.
501 Gutenberg downloadsen2013Difficulty 68 (Academic)
An ethical problem; or, Sidelights upon scientific experimentation on man and animals
Leffingwell, Albert
500 Gutenberg downloadsen2006Difficulty 64 (Academic)
Animal Life in Field and Garden
Fabre, Jean-Henri
500 Gutenberg downloadsen2021Difficulty 47 (College)
Essays on the Microscope Containing a Practical Description of the Most Improved Microscopes, a General History of Insects, etc., etc.
Adams, George
500 Gutenberg downloadsen2020Difficulty 62 (Academic)
General Anatomy, Applied to Physiology and Medicine, Vol. 3 (of 3)
Bichat, Xavier
500 Gutenberg downloadsen2018Difficulty 61 (Academic)
Wood and Forest
Noyes, William
500 Gutenberg downloadsen2011Difficulty 51 (Graduate)
Middle American Frogs of the Hyla microcephala Group
Duellman, William Edward & Fouquette, M. J.
499 Gutenberg downloadsen2010Difficulty 66 (Academic)
Science from an Easy Chair
Lankester, E. Ray (Edwin Ray), Sir
499 Gutenberg downloadsen2018Difficulty 52 (Graduate)
Darwinism stated by Darwin himself Characteristic passages from the writings of Charles Darwin
Darwin, Charles
498 Gutenberg downloadsen2022Difficulty 64 (Academic)
New observations on the natural history of bees
Huber, François
498 Gutenberg downloadsen2008Difficulty 57 (Graduate)
Prehistoric man
Duckworth, W. L. H. (Wynfrid Laurence Henry)
498 Gutenberg downloadsen2013Difficulty 57 (Graduate)
The horse's mouth, showing the age by the teeth
Mayhew, Edward
498 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Food Poisoning
Jordan, Edwin O. (Edwin Oakes)
497 Gutenberg downloadsen2010Difficulty 65 (Academic)
Himalayan Journals — Volume 1 Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.
Hooker, Joseph Dalton
497 Gutenberg downloadsen2004Difficulty 74 (Expert)
Illustrations of Exotic Entomology, Volume 3
Drury, Dru
497 Gutenberg downloadsen2014Difficulty 57 (Graduate)
Mendelism Third Edition
Punnett, Reginald Crundall
496 Gutenberg downloadsen2009Difficulty 61 (Academic)
On the Seashore Cassell's "Eyes and No Eyes" Series, Book VII
Smith, R. Cadwallader
496 Gutenberg downloadsen2003Difficulty 35 (High School)
British Butterflies: Figures and Descriptions of Every Native Species
Coleman, W. S. (William Stephen)
495 Gutenberg downloadsen2010Difficulty 65 (Academic)
On the Method of Zadig Essay #1 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
495 Gutenberg downloadsen2001Difficulty 66 (Academic)
Quadrupeds, What They Are and Where Found: A Book of Zoology for Boys
Reid, Mayne
495 Gutenberg downloadsen2007Difficulty 55 (Graduate)
Rede, gehalten bei der Eröffnung der Versammlung deutscher Naturforscher und Ärzte in Berlin, am 18. September 1828
Humboldt, Alexander von
495 Gutenberg downloadsde2007
Studies in the Theory of Descent, Volume II
Weismann, August
495 Gutenberg downloadsen2015Difficulty 65 (Academic)
The Forest Habitat of the University of Kansas Natural History Reservation
Fitch, Henry S. (Henry Sheldon) & McGregor, Ronald L.
495 Gutenberg downloadsen2010Difficulty 59 (Graduate)
The Lights of the Church and the Light of Science Essay #6 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
495 Gutenberg downloadsen2001Difficulty 70 (Academic)
The Popular Science Monthly, June, 1900 Vol. 57, May, 1900 to October, 1900
Various
494 Gutenberg downloadsen2014Difficulty 69 (Academic)
Scientific American Supplement, No. 385, May 19, 1883
Various
493 Gutenberg downloadsen2005Difficulty 58 (Graduate)
Birds' Nests, Eggs and Egg-Collecting
Kearton, Richard
492 Gutenberg downloadsen2014Difficulty 65 (Academic)
Evolution: Its nature, its evidence, and its relation to religious thought
LeConte, Joseph
492 Gutenberg downloadsen2014Difficulty 88 (Specialist)
Plague Its Cause and the Manner of its Extension, Its Menace, Its Control and Suppression, Its Diagnosis and Treatment
Jackson, Thomas Wright
492 Gutenberg downloadsen2013Difficulty 68 (Academic)
Scientific American Supplement, No. 787, January 31, 1891
Various
492 Gutenberg downloadsen2004Difficulty 53 (Graduate)
The Fairy-Land of Science
Buckley, Arabella B. (Arabella Burton)
492 Gutenberg downloadsen2004Difficulty 48 (College)
An Elementary Text-book of the Microscope including a description of the methods of preparing and mounting objects, etc.
Griffith, J. W. (John William)
491 Gutenberg downloadsen2015Difficulty 52 (Graduate)
Birds, Illustrated by Color Photography, Vol. 1, No. 6 June, 1897
Various
491 Gutenberg downloadsen2009Difficulty 48 (College)
Die epiphytische Vegetation Amerikas
Schimper, A. F. W. (Andreas Franz Wilhelm)
491 Gutenberg downloadsde2007
Flowers of mountain and plain
Clements, Edith S. (Edith Schwartz)
491 Gutenberg downloadsen2014Difficulty 50 (College)
Keys to Fungi on Dung
Richardson, M. J. (Michael J.) & Watling, Roy
491 Gutenberg downloadsen2018Difficulty 57 (Graduate)
On the Preparations of the Indian Hemp, or Gunjah (Cannabis Indica) Their Effects on the Animal System in Health, and Their Utility in the Treatment of Tetanus and Other Convulsive Diseases
O'Shaughnessy, W. B.
491 Gutenberg downloadsen2022Difficulty 63 (Academic)
Species Plantarum, Sections VI-X
Linné, Carl von
491 Gutenberg downloadsla2009
Systematics of Megachiropteran Bats in the Solomon Islands
Phillips, Carleton J.
491 Gutenberg downloadsen2012Difficulty 58 (Graduate)
The British Woodlice Being a Monograph of the Terrestrial Isopod Crustacea Occurring in the British Islands
Webb, Wilfred Mark & Sillem, Charles
491 Gutenberg downloadsen2013Difficulty 58 (Graduate)
Text book of veterinary medicine, Volume 2 (of 5)
Law, James
490 Gutenberg downloadsen2023Difficulty 66 (Academic)
The House Fly and How to Suppress It
Howard, L. O. (Leland Ossian) & Bishopp, F. C. (Fred Corry)
490 Gutenberg downloadsen2006Difficulty 54 (Graduate)
The Rise and Progress of Palaeontology Essay #2 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
490 Gutenberg downloadsen2001Difficulty 77 (Expert)
God and the World: A Survey of Thought
Robinson, Arthur William
489 Gutenberg downloadsen2009Difficulty 60 (Graduate)
Manual of the apiary
Cook, Albert John
489 Gutenberg downloadsen2022Difficulty 49 (College)
Atoms, Nature, and Man: Man-made Radioactivity in the Environment
Hines, Neal O.
488 Gutenberg downloadsen2015Difficulty 68 (Academic)
Barium: A Cause of the Loco-Weed Disease
Crawford, Albert C. (Albert Cornelius)
488 Gutenberg downloadsen2012Difficulty 57 (Graduate)
Beautiful Ferns
Eaton, Daniel Cady
488 Gutenberg downloadsen2014Difficulty 58 (Graduate)
Little Masterpieces of Science: Health and Healing
Unknown
488 Gutenberg downloadsen2014Difficulty 53 (Graduate)
The Origin of Species From 'The Westminster Review', April 1860
Huxley, Thomas Henry
488 Gutenberg downloadsen2001Difficulty 74 (Expert)
The Variation of Animals and Plants under Domestication — Volume 1
Darwin, Charles
488 Gutenberg downloadsen2001Difficulty 62 (Academic)
Greek Biology & Greek Medicine
Singer, Charles
487 Gutenberg downloadsen2020Difficulty 56 (Graduate)
On Snake-Poison: Its Action and Its Antidote
Mueller, A.
487 Gutenberg downloadsen2010Difficulty 69 (Academic)
Scientific American Supplement, No. 799, April 25, 1891
Various
487 Gutenberg downloadsen2004Difficulty 50 (College)
Text book of veterinary medicine, Volume 3 (of 5)
Law, James
487 Gutenberg downloadsen2023Difficulty 63 (Academic)
Criticisms on "The Origin of Species" From 'The Natural History Review', 1864
Huxley, Thomas Henry
486 Gutenberg downloadsen2001Difficulty 64 (Academic)
An Introduction to Entomology: Vol. 2 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
485 Gutenberg downloadsen2013Difficulty 61 (Academic)
De l'origine des espèces
Darwin, Charles
485 Gutenberg downloadsfr2004
The Evolution of Man Scientifically Disproved in 50 Arguments
Williams, William A. (William Asbury)
485 Gutenberg downloadsen2005Difficulty 55 (Graduate)
The Life of the Weevil
Fabre, Jean-Henri & Teixeira de Mattos, Alexander
485 Gutenberg downloadsen2021Difficulty 49 (College)
The Mental Life of Monkeys and Apes: A Study of Ideational Behavior
Yerkes, Robert Mearns
485 Gutenberg downloadsen2004Difficulty 61 (Academic)
A history of land mammals in the western hemisphere
Scott, William Berryman
484 Gutenberg downloadsen2025Difficulty 66 (Academic)
All about Ferrets and Rats A Complete History of Ferrets, Rats, and Rat Extermination from Personal Experiences and Study. Also a Practical Hand-Book on the Ferret.
Isaacsen, Adolph
484 Gutenberg downloadsen2013Difficulty 48 (College)
Little Busybodies: The Life of Crickets, Ants, Bees, Beetles, and Other Busybodies
Marks, Jeannette Augustus & Moody, Julia
484 Gutenberg downloadsen2007Difficulty 34 (High School)
Physiological Researches on Life and Death
Bichat, Xavier
484 Gutenberg downloadsen2018Difficulty 60 (Graduate)
Scientific American Supplement, No. 275, April 9, 1881
Various
484 Gutenberg downloadsen2005Difficulty 57 (Graduate)
Fear
Mosso, A. (Angelo)
483 Gutenberg downloadsen2019Difficulty 59 (Graduate)
Scientific American Supplement, No. 299, September 24, 1881
Various
483 Gutenberg downloadsen2005Difficulty 60 (Graduate)
The Pros and Cons of Vivisection
Richet, Charles
483 Gutenberg downloadsen2011Difficulty 63 (Academic)
Select Specimens of Natural History Collected in Travels to Discover the Source of the Nile. Volume 5.
Bruce, James
482 Gutenberg downloadsen2018Difficulty 64 (Academic)
Poisonous Snakes of Texas and First Aid Treatment of Their Bites Bulletin No. 31
Werler, John E.
481 Gutenberg downloadsen2017Difficulty 58 (Graduate)
The Speech of Monkeys
Garner, R. L. (Richard Lynch)
481 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Common objects of the microscope
Wood, J. G. (John George)
480 Gutenberg downloadsen2017Difficulty 69 (Academic)
Man's Place in the Universe A Study of the Results of Scientific Research in Relation to the Unity or Plurality of Worlds, 3rd Edition
Wallace, Alfred Russel
480 Gutenberg downloadsen2012Difficulty 71 (Expert)
Scientific American Supplement, No. 324, March 18, 1882
Various
480 Gutenberg downloadsen2005Difficulty 53 (Graduate)
Scientific American Supplement, No. 433, April 19, 1884
Various
480 Gutenberg downloadsen2005Difficulty 66 (Academic)
The Conditions of Existence as Affecting the Perpetuation of Living Beings Lecture V. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
480 Gutenberg downloadsen2001Difficulty 64 (Academic)
The Interpreters of Genesis and the Interpreters of Nature Essay #4 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
480 Gutenberg downloadsen2001Difficulty 65 (Academic)
The Popular Science Monthly, July, 1900 Vol. 57, May, 1900 to October, 1900
Various
480 Gutenberg downloadsen2014Difficulty 56 (Graduate)
How to Know the Ferns
Bastin, S. Leonard
479 Gutenberg downloadsen2014Difficulty 50 (College)
Natural Wonders
Brewster, Edwin Tenney
479 Gutenberg downloadsen2015Difficulty 40 (High School)
The Sacred Beetle, and Others
Fabre, Jean-Henri
479 Gutenberg downloadsen2021Difficulty 56 (Graduate)
Colouration in Animals and Plants
Tylor, Alfred
478 Gutenberg downloadsen2014Difficulty 56 (Graduate)
Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado
Douglas, Charles L.
478 Gutenberg downloadsen2012Difficulty 63 (Academic)
The Brain and the Voice in Speech and Song
Mott, F. W. (Frederick Walker)
478 Gutenberg downloadsen2004Difficulty 68 (Academic)
The Evolution of Man — Volume 2
Haeckel, Ernst
478 Gutenberg downloadsen2004Difficulty 55 (Graduate)
Ecological Studies of the Timber Wolf in Northeastern Minnesota
Mech, L. David & Frenzel, Louis Daniel & Karns, P. D. & Ream, Robert R. & Winship, John W.
477 Gutenberg downloadsen2011Difficulty 52 (Graduate)
Scientific American Supplement, No. 286, June 25, 1881
Various
477 Gutenberg downloadsen2005Difficulty 53 (Graduate)
The apiary; or, bees, bee-hives, and bee culture [1865] Being a familiar account of the habits of bees, and the most improved methods of management, with full directions, adapted for the cottager, farmer, or scientific apiarian
Neighbor, Alfred
477 Gutenberg downloadsen2022Difficulty 63 (Academic)
The Evolution of Man — Volume 1
Haeckel, Ernst
477 Gutenberg downloadsen2004Difficulty 52 (Graduate)
The Toxicity of Caffein: An experimental study on different species of animals
Salant, William & Rieger, J. B. (John Benjamin)
477 Gutenberg downloadsen2014Difficulty 63 (Academic)
Birds in Flight
Pycraft, W. P. (William Plane)
476 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Les grands froids
Bouant, Emile
476 Gutenberg downloadsfr2013
The Mason-Wasps
Fabre, Jean-Henri
476 Gutenberg downloadsen2021Difficulty 50 (College)
Zakflora voor Suriname [Deel I] Bulletin van het Koloniaal Museum te Haarlem No. 47.
Pulle, A. A. (August Adriaan)
476 Gutenberg downloadsnl2017
Phrenological Development of Robert Burns From a Cast of His Skull Moulded at Dumfries, the 31st Day of March 1834
Combe, George
475 Gutenberg downloadsen2009Difficulty 58 (Graduate)
The Story of Milk
Frederiksen, Johan Ditlev
475 Gutenberg downloadsen2021Difficulty 64 (Academic)
Useful Knowledge: Volume 3. Animals Or, a familiar account of the various productions of nature
Bingley, William
475 Gutenberg downloadsen2018Difficulty 54 (Graduate)
Agricultural zoology
Ritzema Bos, J. (Jan)
474 Gutenberg downloadsen2025Difficulty 52 (Graduate)
Stray Feathers From a Bird Man's Desk
Rand, Austin Loomer
474 Gutenberg downloadsen2021Difficulty 54 (Graduate)
The Migration of Birds
Coward, T. A. (Thomas Alfred)
474 Gutenberg downloadsen2013Difficulty 67 (Academic)
The Body at Work: A Treatise on the Principles of Physiology
Hill, Alex
473 Gutenberg downloadsen2020Difficulty 54 (Graduate)
Food Habits of the Thrushes of the United States
Beal, F. E. L. (Foster Ellenborough Lascelles)
471 Gutenberg downloadsen2010Difficulty 54 (Graduate)
The Life and Letters of George John Romanes, M.A., LL.D., F.R.S.
Romanes, George John & Romanes, Ethel Duncan
470 Gutenberg downloadsen2015Difficulty 52 (Graduate)
Birds and Nature Vol. 09 No. 3 [March 1901]
Various
469 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Evolution and Classification of the Pocket Gophers of the Subfamily Geomyinae
Russell, Robert J.
469 Gutenberg downloadsen2012Difficulty 65 (Academic)
Zoological Illustrations, Second Series, Volume 1 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
469 Gutenberg downloadsen2013Difficulty 59 (Graduate)
Μικρά Φυσικά, Τόμος Πρώτος
Aristotle
469 Gutenberg downloadsel2009
The honey bee: a manual of instruction in apiculture
Benton, Frank
468 Gutenberg downloadsen2022Difficulty 55 (Graduate)
The Tower Menagerie : $b comprising the natural history of the animals contained in that establishment; with anecdotes of their characters and history.
Bennett, Edward Turner
468 Gutenberg downloadsen2016Difficulty 77 (Expert)
More Beetles
Fabre, Jean-Henri
467 Gutenberg downloadsen2022Difficulty 47 (College)
Natural History of the Prairie Vole (Mammalian Genus Microtus) [KU. Vol. 1 No. 7]
Jameson, E. W. (Everett Williams)
467 Gutenberg downloadsen2011Difficulty 52 (Graduate)
Nouvel atlas de poche des champignons Comestibles et Vénéneux les plus répandus. Série I (Troisième édition) Suivi de notions générales sur les champignons, leur classification, composition chimique, valeur alimentaire, préparation
Dumée, Paul
467 Gutenberg downloadsfr2010
On the Variation of Species, with Especial Reference to the Insecta Followed by an Inquiry into the Nature of Genera
Wollaston, Thomas Vernon
467 Gutenberg downloadsen2012Difficulty 78 (Expert)
A Text-Book of Horseshoeing, for Horseshoers and Veterinarians
Lungwitz, A. (Anton)
466 Gutenberg downloadsen2021Difficulty 55 (Graduate)
Through a Microscope Something of the Science, Together with many Curious Observations Indoor and Out and Directions for a Home-made Microscope.
Wells, Samuel & Sargent, Frederick Leroy & Treat, Mary
466 Gutenberg downloadsen2011Difficulty 48 (College)
Die Welträtsel: Gemeinverständliche Studien über Monistische Philosophie
Haeckel, Ernst
465 Gutenberg downloadsde2019
Evolution: An Investigation and a Critique
Graebner, Theodore
465 Gutenberg downloadsen2006Difficulty 62 (Academic)
Mammals of the San Gabriel Mountains of California
Vaughan, Terry A.
465 Gutenberg downloadsen2011Difficulty 63 (Academic)
Ornithological biography, Vol. 4 (of 5) : $b An account of the habits of the birds of the United States of America
Audubon, John James
465 Gutenberg downloadsen2023Difficulty 62 (Academic)
Regeneration
Morgan, Thomas Hunt
465 Gutenberg downloadsen2018Difficulty 57 (Graduate)
Scientific American Supplement, No. 829, November 21, 1891
Various
465 Gutenberg downloadsen2005Difficulty 63 (Academic)
The Farmer's Veterinarian: A Practical Treatise on the Diseases of Farm Stock
Burkett, Charles William
465 Gutenberg downloadsen2017Difficulty 49 (College)
Birds from Coahuila, Mexico
Urban, Emil K.
464 Gutenberg downloadsen2008Difficulty 55 (Graduate)
The Botanical Magazine, Vol. 03 Or, Flower-Garden Displayed
Curtis, William
464 Gutenberg downloadsen2006Difficulty 57 (Graduate)
American Addresses, with a Lecture on the Study of Biology
Huxley, Thomas Henry
463 Gutenberg downloadsen2005Difficulty 67 (Academic)
The Principles of Breeding or, Glimpses at the Physiological Laws involved in the Reproduction and Improvement of Domestic Animals
Goodale, S. L. (Stephen Lincoln)
463 Gutenberg downloadsen2007Difficulty 57 (Graduate)
Through Magic Glasses and Other Lectures A Sequel to The Fairyland of Science
Buckley, Arabella B. (Arabella Burton)
463 Gutenberg downloadsen2011Difficulty 58 (Graduate)
Fruits of the Hawaiian Islands
Wilder, Gerrit Parmile
462 Gutenberg downloadsen2013Difficulty 52 (Graduate)
Anthropoid apes
Hartmann, Robert
461 Gutenberg downloadsen2025Difficulty 53 (Graduate)
British Museum (Natural History) General Guide
British Museum (Natural History)
461 Gutenberg downloadsen2018Difficulty 69 (Academic)
Scientific American Supplement, No. 303, October 22, 1881
Various
460 Gutenberg downloadsen2005Difficulty 52 (Graduate)
Zoological Illustrations, Second Series, Volume 2 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
460 Gutenberg downloadsen2013Difficulty 60 (Graduate)
Essays in Natural History and Agriculture
Garnett, Thomas
458 Gutenberg downloadsen2006Difficulty 64 (Academic)
On Germinal Selection as a Source of Definite Variation
Weismann, August
458 Gutenberg downloadsen2010Difficulty 69 (Academic)
The Botanical Magazine, Vol. 13 Or, Flower-Garden Displayed
Curtis, William & Sims, John
458 Gutenberg downloadsen2013Difficulty 58 (Graduate)
L'Académie des sciences et les académiciens de 1666 à 1793
Bertrand, Joseph
457 Gutenberg downloadsfr2016
Mazedonien : $b Erlebnisse und Beobachtungen eines Naturforschers im Gefolge des deutschen Heeres
Doflein, Franz
457 Gutenberg downloadsde2023
Darwin, and After Darwin, Volume 3 of 3 Post-Darwinian Questions: Isolation and Physiological Selection
Romanes, George John
456 Gutenberg downloadsen2011Difficulty 66 (Academic)
Introduction to the Study of Palæontological Botany
Balfour, John Hutton
456 Gutenberg downloadsen2016Difficulty 55 (Graduate)
Preservation of Bull Semen at Sub-Zero Temperatures
VanDemark, N. L. & Friedman, M. E. & Kinney, W. C. & Miller, W. J. & Rodriguez, Carlos
456 Gutenberg downloadsen2011Difficulty 62 (Academic)
The ivory king : $b A popular history of the elephant and its allies
Holder, Charles Frederick
456 Gutenberg downloadsen2021Difficulty 54 (Graduate)
The zoology of the voyage of H.M.S. Beagle [vol. 1 of 5] : $b Fossil mammalia
Owen, Richard
456 Gutenberg downloadsen2022Difficulty 58 (Graduate)
Descriptive Zoopraxography; or, the science of animal locomotion made popular
Muybridge, Eadweard
455 Gutenberg downloadsen2012Difficulty 72 (Expert)
Myology and Serology of the Avian Family Fringillidae: A Taxonomic Study
Stallcup, William B.
455 Gutenberg downloadsen2010Difficulty 65 (Academic)
Scientific American Supplement, No. 711, August 17, 1889
Various
455 Gutenberg downloadsen2005Difficulty 61 (Academic)
Studies in Spermatogenesis (Part 1 of 2)
Stevens, N. M. (Nettie Maria)
455 Gutenberg downloadsen2010Difficulty 57 (Graduate)
The Rocky Mountain Goat
Grant, Madison
454 Gutenberg downloadsen2015Difficulty 57 (Graduate)
An Account of the Late Improvements in Galvanism With a Series of Curious and Interesting Experiments Performed Before the Commissioners of the French National Institute, and Repeated Lately in the Anatomical Theatres of London
Aldini, Giovanni
453 Gutenberg downloadsen2018Difficulty 64 (Academic)
The micro-organisms of the soil
Russell, Edward J. (Edward John) & Rothamsted Experimental Station
453 Gutenberg downloadsen2022Difficulty 62 (Academic)
Bog-trotting for orchids
Niles, Grace Greylock
452 Gutenberg downloadsen2025Difficulty 61 (Academic)
De Wereld vóór de schepping van den mensch
Flammarion, Camille
452 Gutenberg downloadsnl2006
Evolution of Life and Form Four lectures delivered at the twenty-third anniversary meeting of the Theosophical Society at Adyar, Madras, 1898
Besant, Annie
452 Gutenberg downloadsen2012Difficulty 60 (Graduate)
Het Leven der Dieren. Deel 3. Afdeling 2. De Visschen
Brehm, Alfred Edmund
452 Gutenberg downloadsnl2016
Duality of Voice
Sutro, Emil
451 Gutenberg downloadsen2015Difficulty 63 (Academic)
Rudiments of Conchology Intended as a familiar introduction to the science.
Venning, Mary Anne
451 Gutenberg downloadsen2015Difficulty 49 (College)
Scientific American Supplement, No. 455, September 20, 1884
Various
451 Gutenberg downloadsen2004Difficulty 57 (Graduate)
Scientific American Supplement, No. 664, September 22,1888
Various
451 Gutenberg downloadsen2008Difficulty 58 (Graduate)
The Factors of Organic Evolution
Spencer, Herbert
451 Gutenberg downloadsen2016Difficulty 70 (Academic)
Dans la Haute-Gambie : $b Voyage d'exploration scientifique, 1891-1892
Rançon, A. (André)
450 Gutenberg downloadsfr2024
Migration of Birds (1979)
Lincoln, Frederick Charles & Peterson, Steven R.
450 Gutenberg downloadsen2021Difficulty 68 (Academic)
The Brain, A Decoded Enigma
Moisa, Dorin Teodor
450 Gutenberg downloadsen2005Difficulty 58 (Graduate)
The Orchid Album, Volume 3 Comprising Coloured Figures and Descriptions of New, Rare, and Beautiful Orchidaceous Plants
Moore, Thomas
450 Gutenberg downloadsen2019Difficulty 57 (Graduate)
The Past Condition of Organic Nature Lecture II. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
450 Gutenberg downloadsen2001Difficulty 65 (Academic)
Earthworms and Their Allies
Beddard, Frank E. (Frank Evers)
448 Gutenberg downloadsen2013Difficulty 59 (Graduate)
Illustrations of the Birds of California, Texas, Oregon, British and Russian America
Cassin, John
448 Gutenberg downloadsen2021Difficulty 63 (Academic)
The botanist's repository for new and rare plants; vol. 03 & 04 [of 10]
Andrews, Henry Cranke, active 1799-1828
448 Gutenberg downloadsen2024Difficulty 55 (Graduate)
Catholic Churchmen in Science [First Series] Sketches of the Lives of Catholic Ecclesiastics Who Were Among the Great Founders in Science
Walsh, James J. (James Joseph)
447 Gutenberg downloadsen2010Difficulty 67 (Academic)
Inorganic Plant Poisons and Stimulants
Brenchley, Winifred Elsie
447 Gutenberg downloadsen2015Difficulty 61 (Academic)
The Coming of Evolution: The Story of a Great Revolution in Science
Judd, John W. (John Wesley)
447 Gutenberg downloadsen2010Difficulty 68 (Academic)
Zeugnisse für die Stellung des Menschen in der Natur
Huxley, Thomas Henry
447 Gutenberg downloadsde2010
Darwin, and After Darwin, Volume 2 of 3 Post-Darwinian Questions: Heredity and Utility
Romanes, George John
446 Gutenberg downloadsen2011Difficulty 64 (Academic)
Journal of Entomology and Zoology, Vol. 11, No. 2, June 1919
Various
446 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Measles
Rucker, William Colby
446 Gutenberg downloadsen2006Difficulty 50 (College)
The Crayfish: An Introduction to the Study of Zoology.
Huxley, Thomas Henry
445 Gutenberg downloadsen2019Difficulty 54 (Graduate)
The Method by Which the Causes of the Present and Past Conditions of Organic Nature Are to Be Discovered; the Origination of Living Beings Lecture III. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
445 Gutenberg downloadsen2001Difficulty 61 (Academic)
A Synopsis of the American Bats of the Genus Pipistrellus
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
444 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Experiments on the Nervous System with Opium and Metalline Substances Made Chiefly with the View of Determining the Nature and Effects of Animal Electricity
Monro, Alexander
444 Gutenberg downloadsen2014Difficulty 66 (Academic)
Scientific American Supplement, No. 613, October 1, 1887
Various
444 Gutenberg downloadsen2005Difficulty 63 (Academic)
A Mechanical Account of Poisons in Several Essays
Mead, Richard
443 Gutenberg downloadsen2016Difficulty 73 (Expert)
Scientific American Supplement, No. 344, August 5, 1882
Various
443 Gutenberg downloadsen2005Difficulty 54 (Graduate)
The Behavior of the Honey Bee in Pollen Collecting
Casteel, Dana Brackenridge
443 Gutenberg downloadsen2012Difficulty 54 (Graduate)
The book of antelopes, vol. 4 (of 4)
Sclater, Philip Lutley & Thomas, Oldfield
443 Gutenberg downloadsen2023Difficulty 48 (College)
The Perpetuation of Living Beings, Hereditary Transmission and Variation Lecture IV. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
443 Gutenberg downloadsen2001Difficulty 66 (Academic)
The Universal Kinship
Moore, J. Howard (John Howard)
443 Gutenberg downloadsen2020Difficulty 54 (Graduate)
Woher die Kindlein kommen
Hoppeler, Hans
443 Gutenberg downloadsde2009
A Bilateral Division of the Parietal Bone in a Chimpanzee; with a Special Reference to the Oblique Sutures in the Parietal
Hrdlička, Aleš
442 Gutenberg downloadsen2010Difficulty 65 (Academic)
The book of antelopes, vol. 2 (of 4)
Sclater, Philip Lutley & Thomas, Oldfield
442 Gutenberg downloadsen2023Difficulty 48 (College)
Coral and Coral Reefs
Huxley, Thomas Henry
441 Gutenberg downloadsen2001Difficulty 58 (Graduate)
Life History of the Kangaroo Rat
Vorhies, Charles Taylor & Taylor, Walter P. (Walter Penn)
441 Gutenberg downloadsen2006Difficulty 62 (Academic)
The Birds of Australia, Vol. 1 of 7
Gould, John
441 Gutenberg downloadsen2021Difficulty 45 (College)
Aromatics and the Soul: A Study of Smells
McKenzie, Dan
440 Gutenberg downloadsen2019Difficulty 53 (Graduate)
Chambers's Journal of Popular Literature, Science, and Art, No. 683 January 27, 1877
Various
440 Gutenberg downloadsen2014Difficulty 50 (College)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, IV. Band Das Emporblühen der modernen Naturwissenschaften seit der Entdeckung des Energieprinzips
Dannemann, Friedrich
440 Gutenberg downloadsde2019
The Naturalist's Repository, Volume 1 (of 5) or Monthly Miscellany of Exotic Natural History: etc. etc.
Donovan, E. (Edward)
440 Gutenberg downloadsen2017Difficulty 76 (Expert)
A Population Study of the Prairie Vole (Microtus ochrogaster) in Northeastern Kansas
Martin, Edwin Perry
439 Gutenberg downloadsen2012Difficulty 61 (Academic)
Chambers's Elementary Science Readers Book I
Various
439 Gutenberg downloadsen2006Difficulty 27 (Middle School)
Evolution and creation
Hardwicke, Herbert Junius
439 Gutenberg downloadsen2017Difficulty 64 (Academic)
Experiments and Observations Relative to the Influence Lately Discovered by M. Galvani and Commonly Called Animal Electricity
Fowler, Richard
439 Gutenberg downloadsen2014Difficulty 64 (Academic)
House Rats and Mice
Lantz, David E. (David Ernest)
439 Gutenberg downloadsen2011Difficulty 51 (Graduate)
Les Phénomènes Psychiques Occultes: État Actuel de la Question
Coste, Albert
439 Gutenberg downloadsfr2013
The Domestic Cat
Stables, Gordon
439 Gutenberg downloadsen2011Difficulty 51 (Graduate)
The Hunting Wasps
Fabre, Jean-Henri
439 Gutenberg downloadsen2022Difficulty 57 (Graduate)
Zoological Illustrations, Second Series, Volume 3 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
439 Gutenberg downloadsen2013Difficulty 61 (Academic)
Aspects of plant life; with special reference to the British flora
Praeger, R. Lloyd (Robert Lloyd)
438 Gutenberg downloadsen2018Difficulty 59 (Graduate)
Fishes of Chautauqua, Cowley and Elk Counties, Kansas
Metcalf, Artie L.
438 Gutenberg downloadsen2010Difficulty 55 (Graduate)
The Dwelling House
Poore, George Vivian
438 Gutenberg downloadsen2015Difficulty 52 (Graduate)
The Gospel of Evolution From "The Atheistic Platform", Twelve Lectures
Aveling, Edward B.
438 Gutenberg downloadsen2011Difficulty 55 (Graduate)
Thoughts on Religion
Romanes, George John
438 Gutenberg downloadsen2005Difficulty 72 (Expert)
An Examination of Weismannism
Romanes, George John
437 Gutenberg downloadsen2015Difficulty 74 (Expert)
Biology : $b A lecture delivered at Columbia University in the series on Science, Philosophy and Art November 20, 1907
Wilson, Edmund B. (Edmund Beecher)
437 Gutenberg downloadsen2006Difficulty 69 (Academic)
On the phenomena of hybridity in the genus Homo
Broca, Paul
437 Gutenberg downloadsen2014Difficulty 66 (Academic)
Travels into North America, Volume 3 (of 3)
Kalm, Pehr
437 Gutenberg downloadsen2024Difficulty 50 (College)
Lamarck et son OEuvre
Corra, Emile
436 Gutenberg downloadsfr2012
On the origin of inflammation of the veins and of the causes, consequences, and treatment of purulent deposits
Lee, Henry, M.D.
436 Gutenberg downloadsen2014Difficulty 65 (Academic)
Records of the Fossil Mammal Sinclairella, Family Apatemyidae, From the Chadronian and Orellan
Clemens, William A. (William Alvin)
436 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Aspects of Reproduction and Development in the Prairie Vole (Microtus ochrogaster)
Fitch, Henry S. (Henry Sheldon)
435 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Bacteria in Daily Life
Frankland, Grace C.
435 Gutenberg downloadsen2013Difficulty 81 (Specialist)
Het Leven der Dieren. Derde Deel, Hoofdstuk 1 tot 4, De Kruipende Dieren
Brehm, Alfred Edmund
435 Gutenberg downloadsnl2014
On the Advisableness of Improving Natural Knowledge
Huxley, Thomas Henry
435 Gutenberg downloadsen2001Difficulty 72 (Expert)
The Botanical Magazine, Vol. 08 Or, Flower-Garden Displayed
Curtis, William
435 Gutenberg downloadsen2008Difficulty 60 (Graduate)
The Study of Plant Life
Stopes, Marie Carmichael
435 Gutenberg downloadsen2019Difficulty 43 (College)
Appletons' Popular Science Monthly, May, 1900 Vol. 57, May, 1900 to October, 1900
Various
434 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Synopsis of Some Genera of the Large Pyrenomycetes Camillea, Thamnomyces, Engleromyces
Lloyd, C. G. (Curtis Gates)
434 Gutenberg downloadsen2007Difficulty 52 (Graduate)
A Review of the Frogs of the Hyla bistincta Group
Duellman, William Edward
433 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Development of the Digestive Canal of the American Alligator
Reese, A. M. (Albert Moore)
433 Gutenberg downloadsen2007Difficulty 58 (Graduate)
The Hand Phrenologically Considered Being a Glimpse at the Relation of the Mind with the Organisation of the Body
Anonymous
433 Gutenberg downloadsen2016Difficulty 70 (Academic)
The honey-bee: its nature, homes and products
Harris, William Hetherington
433 Gutenberg downloadsen2022Difficulty 56 (Graduate)
Westafrikanische Kautschuk-Expedition
Schlechter, Rudolf & Deutsche Kolonialgesellschaft. Kolonial-Wirtschaftliches Komitee
433 Gutenberg downloadsde2022
A Monograph of Odontoglossum
Bateman, Jas. (James)
432 Gutenberg downloadsen2014Difficulty 61 (Academic)
The Myxomycetes of the Miami Valley, Ohio
Morgan, A. P. (Andrew Price)
432 Gutenberg downloadsen2009Difficulty 63 (Academic)
Die Tier- und Pflanzenwelt des Süsswassers. Erster Band.
Forel, F. A. (François Alphonse) & Gruber, August & Ludwig, Friedrich & Migula, W. (Walter) & Plate, Ludwig & Vosseler, Julius & Weltner, Wilhelm
431 Gutenberg downloadsde2024
Evolution and Adaptation
Morgan, Thomas Hunt
431 Gutenberg downloadsen2020Difficulty 62 (Academic)
Grundzüge der Paläontologie (Paläozoologie). 1. Abteilung: Invertebrata.
Zittel, Karl Alfred von
431 Gutenberg downloadsde2023
Handbuch der Pharmakognosie : $b Zweiter Band. Spezielle Pharmakognosie
Tschirch, A. (Alexander)
431 Gutenberg downloadsde2023
The Destiny of Man, Viewed in the Light of His Origin
Fiske, John
431 Gutenberg downloadsen2005Difficulty 65 (Academic)
The works of Francis Maitland Balfour, Volume 4 (of 4) : $b Plates
Balfour, Francis M. (Francis Maitland)
431 Gutenberg downloadsen2014Difficulty 50 (College)
Het Leven der Dieren: Deel 1, Hoofdstuk 04: De Roofdieren
Brehm, Alfred Edmund
430 Gutenberg downloadsnl2006
Jaundice: Its Pathology and Treatment With the Application of Physiological Chemistry to the Detection and Treatment of Diseases of the Liver and Pancreas
Harley, George
430 Gutenberg downloadsen2015Difficulty 69 (Academic)
Reis door Noord Amerika : $b Gedaan door den Heer Pieter Kalm
Kalm, Pehr
430 Gutenberg downloadsnl2023
The Botanical Magazine, Vol. 07 Or, Flower-Garden Displayed
Curtis, William
430 Gutenberg downloadsen2007Difficulty 58 (Graduate)
The winners in life's race : $b Or, the great backboned family
Buckley, Arabella B. (Arabella Burton)
430 Gutenberg downloadsen2024Difficulty 63 (Academic)
A first book in organic evolution
Shute, D. Kerfoot (Daniel Kerfoot)
429 Gutenberg downloadsen2024Difficulty 58 (Graduate)
Ants and Some Other Insects: An Inquiry Into the Psychic Powers of These Animals
Forel, Auguste
429 Gutenberg downloadsen2016Difficulty 70 (Academic)
Die Tier- und Pflanzenwelt des Süsswassers. Zweiter Band.
Apstein, C. (Carl Heinrich) & Borcherding, Friedrich & Clessin, Stephan & Kramer, Paul & Schmidt-Schwedt, E. & Seligo, Arthur & Zschokke, Friedrich
429 Gutenberg downloadsde2024
Fishes of the Big Blue River Basin, Kansas
Minckley, W. L.
429 Gutenberg downloadsen2011Difficulty 47 (College)
Genera and Subgenera of Chipmunks
White, John A.
428 Gutenberg downloadsen2009Difficulty 61 (Academic)
Systematic Status of a South American Frog, Allophryne ruthveni Gaige
Lynch, John D. & Freeman, Howard L.
428 Gutenberg downloadsen2010Difficulty 63 (Academic)
The Botanical Magazine, Vol. 06 Or, Flower-Garden Displayed
Curtis, William
428 Gutenberg downloadsen2007Difficulty 59 (Graduate)
A Description of the Bar-and-Frame-Hive With an Abstract of Wildman's Complete Guide for the Management of Bees Throughout the Year
Munn, William Augustus
427 Gutenberg downloadsen2006Difficulty 57 (Graduate)
Guide to the study of animal ecology
Adams, Charles C. (Charles Christopher)
427 Gutenberg downloadsen2023Difficulty 66 (Academic)
Journal of Entomology and Zoology, Vol. 09, No. 1, March 1917
Various
427 Gutenberg downloadsen2015Difficulty 53 (Graduate)
Science and Morals and Other Essays
Windle, Bertram Coghill Alan, Sir
427 Gutenberg downloadsen2008Difficulty 56 (Graduate)
Scientific American Supplement, No. 648, June 2, 1888.
Various
427 Gutenberg downloadsen2011Difficulty 54 (Graduate)
The Birds of Australia, Vol. 5 of 7
Gould, John
427 Gutenberg downloadsen2020Difficulty 61 (Academic)
The Doctrine of Evolution: Its Basis and Its Scope
Crampton, Henry Edward
427 Gutenberg downloadsen2005Difficulty 65 (Academic)
The Postnatal Development of Two Broods of Great Horned Owls (Bubo virginianus)
Hoffmeister, Donald Frederick & Setzer, Henry W.
427 Gutenberg downloadsen2011Difficulty 51 (Graduate)
Daedalus : $b or, Science and the future
Haldane, J. B. S. (John Burdon Sanderson)
426 Gutenberg downloadsen2023Difficulty 58 (Graduate)
De afstamming van den mensch en de seksueele teeltkeus, deel 2 (van 2)
Darwin, Charles
426 Gutenberg downloadsnl2024
Scientific American Supplement, No. 417, December 29, 1883
Various
426 Gutenberg downloadsen2005Difficulty 65 (Academic)
Canterbury Pieces
Butler, Samuel
425 Gutenberg downloadsen2002Difficulty 55 (Graduate)
Geological Contemporaneity and Persistent Types of Life
Huxley, Thomas Henry
425 Gutenberg downloadsen2001Difficulty 72 (Expert)
Theory of circulation by respiration : $b synopsis of its principles and history
Willard, Emma
425 Gutenberg downloadsen2006Difficulty 57 (Graduate)
Geographic Variation in the Pocket Gopher, Thomomys bottae, in Colorado
Youngman, Phillip M.
424 Gutenberg downloadsen2011Difficulty 57 (Graduate)
Section Cutting and Staining A practical introduction to histological methods for students and practitioners
Colman, Walter S.
424 Gutenberg downloadsen2016Difficulty 50 (College)
New England Salmon Hatcheries and Salmon Fisheries in the Late 19th Century
Various
423 Gutenberg downloadsen2005Difficulty 53 (Graduate)
Animal Castration
Liautard, Alexandre François Augustin
422 Gutenberg downloadsen2019Difficulty 71 (Expert)
Darwinism and Race Progress
Haycraft, John Berry
422 Gutenberg downloadsen2014Difficulty 71 (Expert)
Het Leven der Dieren: Deel 2, Hoofdstuk 04: De Hoendervogels
Brehm, Alfred Edmund
422 Gutenberg downloadsnl2009
Het Leven der Dieren: Deel 1, Hoofdstuk 01: De Apen
Brehm, Alfred Edmund
421 Gutenberg downloadsnl2005
Life and death
Dastre, A. (Albert)
421 Gutenberg downloadsen2021Difficulty 56 (Graduate)
Scientific American Supplement, No. 601, July 9, 1887
Various
421 Gutenberg downloadsen2004Difficulty 53 (Graduate)
Beginselen der dierkunde
Ritzema Bos, J. (Jan)
420 Gutenberg downloadsnl2010
Phylogeny of the Waxwings and Allied Birds
Arvey, M. Dale (Martin Dale)
420 Gutenberg downloadsen2010Difficulty 66 (Academic)
Scientific American Supplement, No. 315, January 14, 1882
Various
420 Gutenberg downloadsen2006Difficulty 63 (Academic)
Scientific American Supplement, No. 794, March 21, 1891
Various
420 Gutenberg downloadsen2005Difficulty 52 (Graduate)
On the Study of Zoology
Huxley, Thomas Henry
419 Gutenberg downloadsen2001Difficulty 66 (Academic)
The Deseado Formation of Patagonia
Loomis, Frederic Brewster
419 Gutenberg downloadsen2024Difficulty 61 (Academic)
The Natural History of the Tea-Tree, with Observations on the Medical Qualities of Tea, and on the Effects of Tea-Drinking
Lettsom, John Coakley
419 Gutenberg downloadsen2021Difficulty 52 (Graduate)
Flowers and their friends
Morley, Margaret Warner
418 Gutenberg downloadsen2024Difficulty 39 (High School)
Harvesting Ants and Trap-Door Spiders Notes and Observations on Their Habits and Dwellings
Moggridge, John Traherne
418 Gutenberg downloadsen2021Difficulty 54 (Graduate)
Influenza : $b An epidemiologic study
Vaughan, Warren T. (Warren Taylor)
418 Gutenberg downloadsen2023Difficulty 66 (Academic)
Parasiten der Honigbiene und die durch dieselben bedingten Krankheiten dieses Insects.
Assmuss, Eduard Philibert
418 Gutenberg downloadsde2006
A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation'
Bowen, Francis
417 Gutenberg downloadsen2008Difficulty 67 (Academic)
Cranial Osteology of the Hylid Frog, Smilisca baudini
Trueb, Linda
417 Gutenberg downloadsen2010Difficulty 61 (Academic)
Embryology: The Beginnings of Life
Leighton, Gerald R. (Gerald Rowley)
417 Gutenberg downloadsen2011Difficulty 59 (Graduate)
Jaw Musculature of the Mourning and White-winged Doves
Merz, Robert L.
417 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Natural History of the Bell Vireo, Vireo bellii Audubon
Barlow, Jon C.
417 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Rust, Smut, Mildew, & Mould: An Introduction to the Study of Microscopic Fungi
Cooke, M. C. (Mordecai Cubitt)
417 Gutenberg downloadsen2020Difficulty 61 (Academic)
The Ancestry of Modern Amphibia: A Review of the Evidence
Eaton, Theodore H. (Theodore Hildreth)
417 Gutenberg downloadsen2011Difficulty 69 (Academic)
The Dolphin in History
Montagu, Ashley & Lilly, John Cunningham
417 Gutenberg downloadsen2019Difficulty 56 (Graduate)
A New Subspecies of the Black Myotis (Bat) from Eastern Mexico
Hall, E. Raymond (Eugene Raymond) & Alvarez, Ticul
416 Gutenberg downloadsen2008Difficulty 55 (Graduate)
Dr. B. Mure's materia medica : $b or, provings of the principal animal and vegetable poisons of the Brazilian Empire, and their application in the treatment of disease
Mure, Benoît
416 Gutenberg downloadsen2023Difficulty 45 (College)
Journal of Entomology and Zoology, Vol. 11, No. 1, March 1919
Various
416 Gutenberg downloadsen2014Difficulty 62 (Academic)
The Story of Creation as Told By Theology and By Science
Ackland, T. S. (Thomas Suter)
416 Gutenberg downloadsen2003Difficulty 62 (Academic)
An Annotated Check List of the Mammals of Michoacán, México
Hall, E. Raymond (Eugene Raymond) & Villa Ramírez, Bernardo
415 Gutenberg downloadsen2012Difficulty 55 (Graduate)
Improved Queen-Rearing; or, How to Rear Large, Prolific, Long-Lived Queen Bees The Result of Nearly Half a Century's Experience in Rearing Queen Bees, Giving the Practical, Every-day Work of the Queen-Rearing Apiary
Alley, Henry
415 Gutenberg downloadsen2019Difficulty 48 (College)
A Critical Examination of the Position of Mr. Darwin's Work, "On the Origin of Species," in Relation to the Complete Theory of the Causes of the Phenomena of Organic Nature Lecture VI. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
414 Gutenberg downloadsen2001Difficulty 67 (Academic)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, I. Band Von den Anfängen bis zum Wiederaufleben der Wissenschaften
Dannemann, Friedrich
414 Gutenberg downloadsde2016
Epidemics Examined and Explained: or, Living Germs Proved by Analogy to be a Source of Disease
Grove, John
414 Gutenberg downloadsen2010Difficulty 65 (Academic)
La vie des termites
Maeterlinck, Maurice
414 Gutenberg downloadsfr2024
Scientific American Supplement No. 822, October 3, 1891
Various
414 Gutenberg downloadsen2005Difficulty 55 (Graduate)
Seventeen Species of Bats Recorded from Barro Colorado Island, Panama Canal Zone
Hall, E. Raymond (Eugene Raymond) & Jackson, William B.
414 Gutenberg downloadsen2009Difficulty 48 (College)
Birds Found on the Arctic Slope of Northern Alaska
Bee, James W.
413 Gutenberg downloadsen2010Difficulty 42 (College)
The Genera of Phyllomedusine Frogs (Anura: Hylidae)
Duellman, William Edward
413 Gutenberg downloadsen2010Difficulty 74 (Expert)
International Weekly Miscellany of Literature, Art and Science — Volume 1, No. 2, July 8, 1850
Various
412 Gutenberg downloadsen2004Difficulty 59 (Graduate)
The Birds of Australia, Vol. 2 of 7
Gould, John
412 Gutenberg downloadsen2019Difficulty 66 (Academic)
A Mechanico-Physiological Theory of Organic Evolution
Nägeli, Carl
411 Gutenberg downloadsen2010Difficulty 74 (Expert)
Botanical features of the Algerian Sahara
Cannon, William Austin
411 Gutenberg downloadsen2023Difficulty 52 (Graduate)
Heroes of science : $b Botanists, zoologists, and geologists
Duncan, P. Martin (Peter Martin)
411 Gutenberg downloadsen2023Difficulty 58 (Graduate)
Epidemic Respiratory Disease The pneumonias and other infections of the repiratory tract accompanying influenza and measles
Opie, Eugene L. (Eugene Lindsay) & Blake, Francis G. (Francis Gilman) & Rivers, Thomas M. (Thomas Milton) & Small, James C. (James Craig)
410 Gutenberg downloadsen2020Difficulty 67 (Academic)
North American Yellow Bats, 'Dasypterus,' and a List of the Named Kinds of the Genus Lasiurus Gray
Hall, E. Raymond (Eugene Raymond) & Jones, J. Knox
410 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Nouvel atlas de poche des champignons Comestibles et Vénéneux les plus répandus. Série II (Première édition)
Dumée, Paul
410 Gutenberg downloadsfr2017
Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado
Anderson, Sydney
410 Gutenberg downloadsen2010Difficulty 50 (College)
The Dancing Mouse: A Study in Animal Behavior
Yerkes, Robert Mearns
410 Gutenberg downloadsen2005Difficulty 64 (Academic)
The Present Condition of Organic Nature Lecture I. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"
Huxley, Thomas Henry
410 Gutenberg downloadsen2001Difficulty 64 (Academic)
Physiological economy in nutrition, with special reference to the minimal proteid requirement of the healthy man an experimental study
Chittenden, R. H. (Russell Henry)
409 Gutenberg downloadsen2022Difficulty 66 (Academic)
A Discourse on the Plague
Mead, Richard
408 Gutenberg downloadsen2010Difficulty 61 (Academic)
Bees
Phillips, Everett Franklin
408 Gutenberg downloadsen2015Difficulty 52 (Graduate)
Descripción Geografica, Histórica y Estadística de Bolivia, Tomo 1.
Orbigny, Alcide Dessalines d'
408 Gutenberg downloadses2004
Der Unterkiefer des Homo Heidelbergensis: Aus den Sanden von Mauer bei Heidelberg
Schoetensack, Otto
407 Gutenberg downloadsde2011
Grundriß der menschlichen Erblichkeitslehre und Rassenhygiene (2/2) Menschliche Auslese und Rassenhygiene
Lenz, Fritz
407 Gutenberg downloadsde2015
Mammals Obtained by Dr. Curt von Wedel from the Barrier Beach of Tamaulipas, Mexico
Hall, E. Raymond (Eugene Raymond)
407 Gutenberg downloadsen2009Difficulty 53 (Graduate)
Adequate Preparation for the Teacher of Biological Sciences in Secondary Schools
McDonald, J. Daley (James Daley)
406 Gutenberg downloadsen2010Difficulty 64 (Academic)
Natural History of the Salamander, Aneides hardii
Johnston, Richard F. & Schad, G. A.
406 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains
Fitch, Henry S. (Henry Sheldon) & Maslin, T. Paul
406 Gutenberg downloadsen2010Difficulty 66 (Academic)
On the Origin and Metamorphoses of Insects
Lubbock, John, Sir
406 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Scientific American magazine, Vol. 2 Issue 1 The advocate of Industry and Journal of Scientific, Mechanical and Other Improvements
Various
406 Gutenberg downloadsen2009Difficulty 52 (Graduate)
Systematic Status of the Colubrid Snake, Leptodeira discolor Günther
Duellman, William Edward
406 Gutenberg downloadsen2011Difficulty 63 (Academic)
The Present Method of Inoculating for the Small-Pox To which are added, some experiments, instituted with a view to discover the effects of a similar treatment in the natural small-pox
Dimsdale, Thomas
406 Gutenberg downloadsen2015Difficulty 68 (Academic)
The Wild Elephant and the Method of Capturing and Taming it in Ceylon
Tennent, James Emerson, Sir
406 Gutenberg downloadsen2018Difficulty 65 (Academic)
Through a pocket lens
Scherren, Henry
405 Gutenberg downloadsen2022Difficulty 43 (College)
A Manual of Conchology According to the System Laid Down by Lamarck, with the Late Improvements by De Blainville. Exemplified and Arranged for the Use of Students.
Wyatt, Thomas
404 Gutenberg downloadsen2018Difficulty 58 (Graduate)
Het Leven der Dieren: Deel 1, Hoofdstuk 11: De Evenvingerigen
Brehm, Alfred Edmund
403 Gutenberg downloadsnl2007
Noteworthy Mammals from Sinaloa, Mexico
Jones, J. Knox & Alvarez, Ticul & Lee, M. Raymond
403 Gutenberg downloadsen2010Difficulty 52 (Graduate)
The flowering plants of South Africa; vol. 4
Pole Evans, I. B. (Illtyd Buller)
403 Gutenberg downloadsen2023Difficulty 49 (College)
The Forests of Mount Rainier National Park
Allen, G. F. (Grenville F.)
403 Gutenberg downloadsen2010Difficulty 49 (College)
The Subspecific Status of Two Central American Sloths
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
403 Gutenberg downloadsen2010Difficulty 62 (Academic)
Vivisection
Leffingwell, Albert
403 Gutenberg downloadsen2010Difficulty 64 (Academic)
A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas
Eaton, Theodore H. (Theodore Hildreth) & Stewart, Peggy Lou
402 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Geographic Range of the Hooded Skunk, Mephitis macroura With Description of a New Subspecies from Mexico
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
402 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Tentamen Botanicum de Filicum Generibus Dorsiferarum Mémoires de l'Académie Royale des Sciences de Turin vol. 5, 401-422
Smith, James Edward
402 Gutenberg downloadsla2012
The Popular Science Monthly, August, 1900 Vol. 57, May, 1900 to October, 1900
Various
402 Gutenberg downloadsen2014Difficulty 68 (Academic)
The Story of Germ Life
Conn, H. W. (Herbert William)
402 Gutenberg downloadsen2004Difficulty 60 (Graduate)
A New Hylid Frog from Eastern Mexico. University of Kansas Publication, Vol 1, No 15
Taylor, Edward Harrison
401 Gutenberg downloadsen2010Difficulty 62 (Academic)
Studies on Epidemic Influenza: Comprising Clinical and Laboratory Investigations
University of Pittsburgh. School of Medicine
401 Gutenberg downloadsen2019Difficulty 62 (Academic)
The alligator and its allies
Reese, A. M. (Albert Moore)
401 Gutenberg downloadsen2023Difficulty 53 (Graduate)
Ecology of the Opossum on a Natural Area in Northeastern Kansas
Fitch, Henry S. (Henry Sheldon) & Sandidge, Lewis L.
400 Gutenberg downloadsen2011Difficulty 62 (Academic)
Geographic Variation in the North American Cyprinid Fish, Hybopsis gracilis
Olund, Leonard J. & Cross, Frank B. (Frank Bernard)
400 Gutenberg downloadsen2011Difficulty 57 (Graduate)
Note on the Resemblances and Differences in the Structure and the Development of the Brain in Man and Apes
Huxley, Thomas Henry & Darwin, Charles
400 Gutenberg downloadsen2000Difficulty 66 (Academic)
Scientific American Supplement, No. 441, June 14, 1884.
Various
400 Gutenberg downloadsen2005Difficulty 56 (Graduate)
Studies of trees in winter : $b A description of the deciduous trees of northeastern America
Huntington, Annie Oakes
400 Gutenberg downloadsen2024Difficulty 51 (Graduate)
The genetic and the operative evidence relating to secondary sexual characters
Morgan, Thomas Hunt
400 Gutenberg downloadsen2018Difficulty 47 (College)
A New Doglike Carnivore, Genus Cynarctus, From the Clarendonian, Pliocene, of Texas
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
399 Gutenberg downloadsen2009Difficulty 53 (Graduate)
Essays in eugenics
Galton, Francis
399 Gutenberg downloadsen2024Difficulty 59 (Graduate)
La philosophie zoologique avant Darwin
Perrier, Edmond
399 Gutenberg downloadsfr2010
Half Hours With Modern Scientists: Lectures and Essays
Huxley, Thomas Henry & Barker, George F. (George Frederick) & Cope, E. D. (Edward Drinker) & Stirling, James Hutchison & Tyndall, John
398 Gutenberg downloadsen2021Difficulty 66 (Academic)
Het Leven der Dieren: Deel 2, Hoofdstuk 01: De Boomvogels.
Brehm, Alfred Edmund
398 Gutenberg downloadsnl2009
Het paddenstoelenboekje
Cool, Cath. (Catharina) & Lek, H. A. A. van der (Hendrik Adrianus Abraham)
398 Gutenberg downloadsnl2015
Journal of Entomology and Zoology, Vol. 06, No. 4, December 1914
Various
398 Gutenberg downloadsen2015Difficulty 53 (Graduate)
Journal of Entomology and Zoology, Vol. 11, No. 4, December 1919
Various
398 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Race Improvement; or, Eugenics: A Little Book on a Great Subject
Baker, La Reine Helen McKenzie
398 Gutenberg downloadsen2015Difficulty 63 (Academic)
Animal portraiture
Lydekker, Richard
397 Gutenberg downloadsen2023Difficulty 58 (Graduate)
Dissection of the Platana and the Frog
Gilchrist, J. D. F. (John Dow Fisher) & Bonde, Cecil von
397 Gutenberg downloadsen2015Difficulty 51 (Graduate)
Hormones and Heredity A Discussion of the Evolution of Adaptations and the Evolution of Species
Cunningham, J. T. (Joseph Thomas)
397 Gutenberg downloadsen2005Difficulty 73 (Expert)
Natur und Mensch Sechs Abschnitte aus Werken von Ernst Haeckel
Haeckel, Ernst
397 Gutenberg downloadsde2015
The Natural History of Chocolate Being a Distinct and Particular Account of the Cocoa-Tree, its Growth and Culture, and the Preparation, Excellent Properties, and Medicinal Vertues of its Fruit
Quélus, D.
397 Gutenberg downloadsen2008Difficulty 52 (Graduate)
Zoological Illustrations, Volume 3 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
397 Gutenberg downloadsen2012Difficulty 60 (Graduate)
Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico
Jones, J. Knox
396 Gutenberg downloadsen2009Difficulty 55 (Graduate)
The Minor Horrors of War
Shipley, A. E. (Arthur Everett), Sir
396 Gutenberg downloadsen2021Difficulty 51 (Graduate)
The Underworld of Oregon Caves National Monument
Contor, Roger J.
396 Gutenberg downloadsen2019Difficulty 56 (Graduate)
Unsere Haustiere vom Standpunkte ihrer wilden Verwandten
Zell, Th. (Theodor)
396 Gutenberg downloadsde2018
Fish Populations, Following a Drought, in the Neosho and Marais des Cygnes Rivers of Kansas
Deacon, James E.
395 Gutenberg downloadsen2010Difficulty 52 (Graduate)
Last Words on Evolution: A Popular Retrospect and Summary
Haeckel, Ernst
395 Gutenberg downloadsen2016Difficulty 68 (Academic)
Scientific Essays and Lectures
Kingsley, Charles
395 Gutenberg downloadsen2003Difficulty 56 (Graduate)
De Reis om de Wereld
Darwin, Charles
393 Gutenberg downloadsnl2010
Memorias sobre a influencia dos descobrimentos portuguezes no conhecimento das plantas I. - Memoria sobre a Malagueta
Ficalho, Francisco Manuel de Melo, Conde de
393 Gutenberg downloadspt2009
Venomous arthropod handbook : $b envenomization symptoms/treatment, identification, biology and control
Biery, Terry L.
393 Gutenberg downloadsen2018Difficulty 66 (Academic)
The Philosophy of Health; Volume 1 (of 2) or, an exposition of the physical and mental constitution of man
Smith, Southwood
392 Gutenberg downloadsen2019Difficulty 73 (Expert)
Radioisotopes and Life Processes (Revised)
Kisieleski, Walter E. & Baserga, Renato
391 Gutenberg downloadsen2015Difficulty 66 (Academic)
The philosophy of biology
Johnstone, James
391 Gutenberg downloadsen2020Difficulty 65 (Academic)
Whale Primer, with Special Attention to the California Gray Whale
Walker, Theodore J.
391 Gutenberg downloadsen2019Difficulty 55 (Graduate)
A Dissertation on Horses Wherein It is Demonstrated, by Matters of Fact, as Well as from the Principles of Philosophy, That Innate Qualities Do Not Exist, and That the Excellence of This Animal is Altogether Mechanical and Not in the Blood
Osmer, William
390 Gutenberg downloadsen2004Difficulty 64 (Academic)
Le Sud-Oranais: études floristiques et phytogéographiques faites au cours d'une exploration dans le Sud-Ouest de l'Algérie en 1901
Hochreutiner, B. P. G. (Bénédict Pierre Georges)
390 Gutenberg downloadsfr2025
The Scientific Evidences of Organic Evolution
Romanes, George John
390 Gutenberg downloadsen2006Difficulty 67 (Academic)
A New Subspecies of Lizard, Cnemidophorus sacki, from Michoacán, México
Duellman, William Edward
389 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Die organische Chemie in ihrer Anwendung auf Physiologie und Pathologie
Liebig, Justus, Freiherr von
389 Gutenberg downloadsde2017
Life among the butterflies
Randolph, Vance
389 Gutenberg downloadsen2022Difficulty 56 (Graduate)
Meinauer Naturlehre
Unknown
389 Gutenberg downloadsde2009
Some possible bearings of genetics on pathology
Morgan, Thomas Hunt
389 Gutenberg downloadsen2023Difficulty 57 (Graduate)
Einheimische Fische; Die Süßwasserfische unsrer Heimat
Floericke, Kurt
388 Gutenberg downloadsde2012
The Microscope
Ross, Andrew
388 Gutenberg downloadsen2013Difficulty 65 (Academic)
The Pocket Gophers (Genus Thomomys) of Utah University of Kansas Publications, Museum of Natural History, Vol. 1 No. 1
Durrant, Stephen David
388 Gutenberg downloadsen2012Difficulty 57 (Graduate)
A New Subspecies of Slider Turtle (Pseudemys scripta) from Coahuila, México
Legler, John M.
387 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Eugenics as a Factor in the Prevention of Mental Disease
Pollock, Horatio M. (Horatio Milo)
387 Gutenberg downloadsen2011Difficulty 65 (Academic)
The flowering plants of South Africa; vol. 5
Pole Evans, I. B. (Illtyd Buller)
387 Gutenberg downloadsen2025Difficulty 50 (College)
The Systematics of the Frogs of the Hyla Rubra Group in Middle America
León, Juan R.
387 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Pipistrellus cinnamomeus Miller 1902 Referred to the Genus Myotis
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
386 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Complete Treatise on the mare and foal at the time of delivery, with illustrations. Also on cows and calves, with stallion and mare, when diseased by Gonorrhea (clap) or Pox, also Diarrhea and Costiveness in Colts.
Mitchell, Conrad
385 Gutenberg downloadsen2016Difficulty 49 (College)
Five Natural Hybrid Combinations in Minnows (Cyprinidae)
Cross, Frank B. (Frank Bernard) & Minckley, W. L.
385 Gutenberg downloadsen2011Difficulty 55 (Graduate)
A Quantitative Study of the Nocturnal Migration of Birds
Lowery, George H., Jr.
384 Gutenberg downloadsen2011Difficulty 55 (Graduate)
Het Leven der Dieren, Deel 3, Hoofdstuk 6: De Wormen
Brehm, Alfred Edmund
384 Gutenberg downloadsnl2020
Taxonomic Notes on Mexican Bats of the Genus Rhogeëssa
Hall, E. Raymond (Eugene Raymond)
384 Gutenberg downloadsen2010Difficulty 50 (College)
The American Bee Journal, Volume VI, Number 3, September 1870
Various
383 Gutenberg downloadsen2018Difficulty 56 (Graduate)
The flowering plants of South Africa; vol. 2
Unknown
383 Gutenberg downloadsen2021Difficulty 51 (Graduate)
Den Hunting as a Means of Coyote Control
Young, Stanley Paul & Dobyns, Harold Warren
382 Gutenberg downloadsen2015Difficulty 49 (College)
Sanitation in Panama
Gorgas, William Crawford
382 Gutenberg downloadsen2023Difficulty 56 (Graduate)
Species Plantarum, Sections XI-XIII
Linné, Carl von
382 Gutenberg downloadsla2010
ABC's of Science
Oliver, Charles A. (Charles Alexander)
381 Gutenberg downloadsen1998Difficulty 51 (Graduate)
Comments on the Taxonomy and Geographic Distribution of Some North American Marsupials, Insectivores and Carnivores
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
381 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Sphinx Vespiformis: An Essay
Newman, Edward
381 Gutenberg downloadsen2013Difficulty 73 (Expert)
The human foot and the human hand
Humphry, George Murray, Sir
381 Gutenberg downloadsen2025Difficulty 48 (College)
The plurality of the human race
Pouchet, G. (Georges)
381 Gutenberg downloadsen2023Difficulty 61 (Academic)
Subspeciation in Pocket Gophers of Kansas, [KU. Vol. 1 No. 11]
Villa Ramírez, Bernardo & Hall, E. Raymond (Eugene Raymond)
380 Gutenberg downloadsen2011Difficulty 58 (Graduate)
Records of Harvest Mice, Reithrodontomys, from Central America, with Description of a New Subspecies from Nicaragua
Anderson, Sydney & Jones, J. Knox
379 Gutenberg downloadsen2010Difficulty 55 (Graduate)
A Profitable Instruction of the Perfite Ordering of Bees With the Maruellous Nature, Propertie, and Gouernemente of Them: and the Necessarie Vses Both of Their Honie and Waxe, Seruing Diuersly, as Well in Inward as Outward Causes: Gathered Out of the Best Writers
Hill, Thomas
378 Gutenberg downloadsen2014Difficulty 50 (College)
Apes and Monkeys: Their Life and Language
Garner, R. L. (Richard Lynch)
377 Gutenberg downloadsen2022Difficulty 55 (Graduate)
Handboek voor den kaasmaker in Nederland
Hollman, Pierre Jean
377 Gutenberg downloadsnl2010
Practical Skunk Raising A Book of Information Concerning the Raising of Skunks for Profit
Pratt, William Edwin
377 Gutenberg downloadsen2014Difficulty 40 (High School)
The Botanical Magazine, Vol. 09 Or, Flower-Garden Displayed
Curtis, William
377 Gutenberg downloadsen2011Difficulty 58 (Graduate)
The Systematic Status of Eumeces pluvialis Cope
Smith, Hobart M. (Hobart Muir)
377 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Treatise on the Anatomy and Physiology of the Mucous Membranes With Illustrative Pathological Observations
Bichat, Xavier
377 Gutenberg downloadsen2016Difficulty 67 (Academic)
Carlo Darwin
Lessona, Michele
376 Gutenberg downloadsit2014
Descriptions of Three New Birds from the Belgian Congo Bulletin of the AMNH , Vol. XXXIV, Art. XVI, pp. 509-513, Oct. 20th, 1915
Chapin, James Paul
376 Gutenberg downloadsen2010Difficulty 49 (College)
Graphic illustrations of abortion and the diseases of menstruation Consisting of Twelve Plates from Drawings Engraved on Stone, and Coloured by Mr. J. Perry, and Two Copper-plates from the Philosophical Transactions, Coloured by the Same Artist. the Whole Representing Forty-five Specimens of Aborted Ova and Adventitious Productions of the Uterus, With Preliminary Observations, Explanations of the Figures and Remarks, Anatomical and Physiological.
Granville, A. B. (Augustus Bozzi)
376 Gutenberg downloadsen2019Difficulty 61 (Academic)
The Conchologist's First Book A System of Testaceous Malacology, Arranged Expressly for the Use of Schools, in Which the Animals, According to Cuvier, Are Given With the Shells, a Great Number of New Species Added, and the Whole Brought Up, as Accurately as Possible, to the Present Condition of the Science.
Poe, Edgar Allan & Brown, Thomas
376 Gutenberg downloadsen2021Difficulty 53 (Graduate)
The octopus : $b or, The "devil-fish" of fiction and of fact
Lee, Henry
376 Gutenberg downloadsen2023Difficulty 61 (Academic)
Antony van Leeuwenhoek, de ontdekker der infusorien, 1675-1875
Haaxman, P. J.
375 Gutenberg downloadsnl2021
Lehrbuch der Toxikologie für Tierärzte
Fröhner, Eugen
375 Gutenberg downloadsde2022
New West Indian Spiders Bulletin of the AMNH, Vol. XXXIII, Art. XLI, pp. 639-642
Banks, Nathan
375 Gutenberg downloadsen2010Difficulty 47 (College)
Phrenology Examined
Flourens, P. (Pierre)
375 Gutenberg downloadsen2021Difficulty 59 (Graduate)
Selected Records of Reptiles and Amphibians from Kansas
Breukelman, John & Smith, Hobart M. (Hobart Muir)
375 Gutenberg downloadsen2010Difficulty 47 (College)
The chocolate-plant (Theobroma cacao) and its products
Anonymous
375 Gutenberg downloadsen2025Difficulty 55 (Graduate)
The modes of origin of lowest organisms including a discussion of the experiments of M. Pasteur
Bastian, H. Charlton
375 Gutenberg downloadsen2015Difficulty 71 (Expert)
A New Extinct Emydid Turtle from the Lower Pliocene of Oklahoma
Galbreath, Edwin C. (Edwin Carter)
374 Gutenberg downloadsen2010Difficulty 59 (Graduate)
A Treatise of Buggs
Southall, John
374 Gutenberg downloadsen2015Difficulty 56 (Graduate)
Marxism and Darwinism : $b Evidence, speeches, and papers in its favour
Pannekoek, Anton
374 Gutenberg downloadsen2023Difficulty 58 (Graduate)
The botanist's repository for new and rare plants; vol. 07 [of 10]
Andrews, Henry Cranke, active 1799-1828
374 Gutenberg downloadsen2024Difficulty 57 (Graduate)
The fauna of the deep sea
Hickson, Sydney J. (Sydney John)
374 Gutenberg downloadsen2021Difficulty 63 (Academic)
The Subspecies of the Mountain Chickadee
Grinnell, Joseph
374 Gutenberg downloadsen2010Difficulty 50 (College)
Het Leven der Dieren: Deel 3.7, De Weekdieren
Brehm, Alfred Edmund
373 Gutenberg downloadsnl2020
Home Range and Movements of the Eastern Cottontail in Kansas
Janes, Donald W.
373 Gutenberg downloadsen2009Difficulty 55 (Graduate)
Bee-keeping for profit
Morley, W. S.
372 Gutenberg downloadsen2022Difficulty 53 (Graduate)
I funghi mangerecci e velenosi dell'Europa media con speciale riguardo a quelli che crescono nel Trentino - II edizione riveduta ed aumentata
Bresadola, Giacomo
372 Gutenberg downloadsit2013
Palm trees of the Amazon and their uses
Wallace, Alfred Russel
372 Gutenberg downloadsen2023Difficulty 62 (Academic)
The English moths and butterflies : $b Together with the plants, flowers, and fruits whereon they feed, and are usually found.
Wilkes, Benjamin
372 Gutenberg downloadsen2024Difficulty 58 (Graduate)
A New Genus of Pennsylvanian Fish (Crossopterygii, Coelacanthiformes) from Kansas
Echols, Joan
371 Gutenberg downloadsen2010Difficulty 60 (Graduate)
El Campesino Puertorriqueño Sus Condiciones Físicas, Intelectuales y Morales, Causas que la Determinan y Medios Para Mejorarlas
Valle Atiles, Francisco del
371 Gutenberg downloadses2015
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, III. Band Das Emporblühen der modernen Naturwissenschaften bis zur Entdeckung des Energieprinzipes
Dannemann, Friedrich
370 Gutenberg downloadsde2018
Die Zelle
Kahn, Fritz
370 Gutenberg downloadsde2012
The Botanical Magazine, Vol. 10 Or, Flower-Garden Displayed
Curtis, William
370 Gutenberg downloadsen2020Difficulty 57 (Graduate)
The botanist's repository for new and rare plants; vol. 08 [of 10]
Andrews, Henry Cranke, active 1799-1828
370 Gutenberg downloadsen2024Difficulty 58 (Graduate)
Μικρά Φυσικά, Τόμος Δεύτερος
Aristotle
370 Gutenberg downloadsel2009
Bee Keeping
Benton, Frank
369 Gutenberg downloadsen2015Difficulty 63 (Academic)
Het Leven der Dieren: Hoofdstuk 7: De Pluviervogels
Brehm, Alfred Edmund
369 Gutenberg downloadsnl2010
Morphological Variation in a Population of the Snake, Tantilla gracilis Baird and Girard
Hardy, Laurence M. & Cole, Charles J.
369 Gutenberg downloadsen2010Difficulty 55 (Graduate)
The botanist's repository for new and rare plants; vol. 09 [of 10]
Andrews, Henry Cranke, active 1799-1828
369 Gutenberg downloadsen2024Difficulty 55 (Graduate)
The Migration of North American Birds (1935)
Lincoln, Frederick Charles
369 Gutenberg downloadsen2021Difficulty 71 (Expert)
Descripção de algumas especies novas ou pouco conhecidas de crustaceos e arachnidios de Portugal e possessões portuguezas do ultramar
Capello, Felix Antonio de Brito
368 Gutenberg downloadsfr2010
Essays on Darwinism
Stebbing, Thomas Roscoe Rede
368 Gutenberg downloadsen2015Difficulty 63 (Academic)
Histoire naturelle des oiseaux d'Afrique, t. 1
Le Vaillant, François
368 Gutenberg downloadsfr2018
Kyphosis and other Variations in Soft-shelled Turtles
Smith, Hobart M. (Hobart Muir)
368 Gutenberg downloadsen2010Difficulty 46 (College)
Mammals taken Along the Alaska Highway
Baker, Rollin H. (Rollin Harold)
368 Gutenberg downloadsen2010Difficulty 47 (College)
Physiology and histology of the Cubomedusæ including Dr. F.S. Conant's notes on the physiology
Berger, E. W. (Edward William)
368 Gutenberg downloadsen2017Difficulty 62 (Academic)
The ethics of Hercules : $b A study of man's body as the sole determinant of ethical values
Givler, Robert Chenault
368 Gutenberg downloadsen2023Difficulty 63 (Academic)
The Protection of Fresh-Water Mussels
Coker, R. E. (Robert Ervin)
368 Gutenberg downloadsen2013Difficulty 65 (Academic)
Migration of Birds (1950)
Lincoln, Frederick Charles
367 Gutenberg downloadsen2021Difficulty 70 (Academic)
Proceedings of the California Academy of Sciences, Series 3, Volume 4 (Zoology)
Various
367 Gutenberg downloadsen2017Difficulty 70 (Academic)
Schenk's Theory: The Determination of Sex
Schenk, Samuel Leopold
367 Gutenberg downloadsen2014Difficulty 59 (Graduate)
A New Subspecies of Wood Rat (Neotoma mexicana) from Colorado
Finley, Robert B.
366 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Geographic Variation in Red-backed Mice (Genus Clethrionomys) of the Southern Rocky Mountain Region
Cockrum, E. Lendell & Fitch, Kenneth Leonard
366 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Nests and Eggs of Familiar British Birds, Second Series Described and Illustrated; with an Account of the Haunts and Habits of the Feathered Architects, and their Times and Modes of Building
Adams, H. G. (Henry Gardiner)
366 Gutenberg downloadsen2012Difficulty 60 (Graduate)
Studies of Birds Killed in Nocturnal Migration
Tordoff, Harrison Bruce & Mengel, Robert Morrow
366 Gutenberg downloadsen2016Difficulty 54 (Graduate)
Texas Honey Plants
Sanborn, Charles Emerson & Scholl, Ernest E. (Ernest Emmett)
366 Gutenberg downloadsen2012Difficulty 53 (Graduate)
The Cubomedusæ
Conant, Franklin Story
366 Gutenberg downloadsen2017Difficulty 60 (Graduate)
Memoir on the Dodo (Didus ineptus, Linn.)
Owen, Richard
365 Gutenberg downloadsen2025Difficulty 57 (Graduate)
Notes on Diseases of Swine, Sheep, Poultry and the Dog Cause, Symptoms and Treatments
Korinek, Charles James
365 Gutenberg downloadsen2019Difficulty 55 (Graduate)
The puzzle of life and how it has been put together : $b A short history of the formation of the earth, with its vegetable and animal life, from the earliest times, including an account of prehistoric man, his weapons, tools, and works
Nicols, Arthur
365 Gutenberg downloadsen2025Difficulty 49 (College)
Louis Agassiz as a Teacher; illustrative extracts on his method of instruction
Cooper, Lane
364 Gutenberg downloadsen2004Difficulty 56 (Graduate)
Comments on the Taxonomy and Geographic Distribution of North American Microtines
Hall, E. Raymond (Eugene Raymond) & Cockrum, E. Lendell
363 Gutenberg downloadsen2009Difficulty 62 (Academic)
Description of a New Softshell Turtle from the Southeastern United States
Webb, Robert G. (Robert Gravem)
363 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Report on the Migration of Birds in the Spring and Autumn of 1881. Third Report
Harvie-Brown, J. A. (John Alexander) & Barrington, Richard Manliffe & Cordeaux, John & Kermode, P. M. C. (Philip Moore Callow) & More, Alexander Goodman
363 Gutenberg downloadsen2021Difficulty 41 (College)
The Mammals of Washtenaw County, Michigan Occasional Papers of the Museum of Zoology, No. 123
Wood, Norman Asa
363 Gutenberg downloadsen2010Difficulty 44 (College)
Illustrated Index of British Shells Containing figures of all the recent species
Sowerby, G. B. (George Brettingham)
362 Gutenberg downloadsen2013Difficulty 53 (Graduate)
The Salmon Fishery of Penobscot Bay and River in 1895-96
Smith, Hugh M. (Hugh McCormick)
362 Gutenberg downloadsen2005Difficulty 48 (College)
The Science of Animal Locomotion (Zoopraxography) An Electro-Photographic Investigation of Consecutive Phases of Animal Movements
Muybridge, Eadweard
362 Gutenberg downloadsen2012Difficulty 64 (Academic)
De martelaars der wetenschap
Tissandier, Gaston
361 Gutenberg downloadsnl2018
Little Wanderers
Morley, Margaret Warner
361 Gutenberg downloadsen2020Difficulty 41 (College)
The Coal Measures Amphibia of North America
Moodie, Roy Lee
361 Gutenberg downloadsen2019Difficulty 62 (Academic)
The Kingdom of Man
Lankester, E. Ray (Edwin Ray), Sir
361 Gutenberg downloadsen2019Difficulty 61 (Academic)
The Philosophy of Health; Volume 2 (of 2) or, an exposition of the physical and mental constitution of man
Smith, Southwood
361 Gutenberg downloadsen2019Difficulty 72 (Expert)
A guide to the shell and starfish galleries : $b (Mollusca, Polyzoa, Brachiopoda, Tunicata, Echinoderma, and Worms)
British Museum (Natural History). Department of Zoology & Bell, F. J. (Francis Jeffrey) & Kirkpatrick, R. (Randolph) & Smith, E. A. (Edgar Albert)
360 Gutenberg downloadsen2024Difficulty 59 (Graduate)
A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope
Lynch, John D.
360 Gutenberg downloadsen2011Difficulty 64 (Academic)
Comments on the Taxonomy and Geographic Distribution of Some North American Rodents
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
360 Gutenberg downloadsen2010Difficulty 56 (Graduate)
Descriptions of New Hylid Frogs From Mexico and Central America
Duellman, William Edward
360 Gutenberg downloadsen2010Difficulty 64 (Academic)
Het Leven der Dieren: Deel 2, Hoofdstuk 05: De Ralvogels; Hoofdstuk 06: De Kraanvogels
Brehm, Alfred Edmund
360 Gutenberg downloadsnl2009
Le Tour du Monde; Voyage d'un naturaliste. Journal des voyages et des voyageurs; 2. sem. 1860
Various
360 Gutenberg downloadsfr2008
Scientific American Supplement, No. 358, November 11, 1882
Various
360 Gutenberg downloadsen2005Difficulty 61 (Academic)
Self-Organizing Systems, 1963
Unknown
360 Gutenberg downloadsen2021Difficulty 72 (Expert)
An inaugural dissertation on pulmonary consumption
Delafield, Edward
359 Gutenberg downloadsen2022Difficulty 63 (Academic)
The Anatomy of Vegetables Begun With a General Account of Vegetation founded thereon
Grew, Nehemiah
359 Gutenberg downloadsen2018Difficulty 48 (College)
A New Tortoise, Genus Gopherus, From North-central Mexico
Legler, John M.
358 Gutenberg downloadsen2010Difficulty 62 (Academic)
De Usu Ratiocinii Mechanici in Medicina
Boerhaave, Herman
358 Gutenberg downloadsla2005
Natural History of the Brush Mouse (Peromyscus boylii) in Kansas With Description of a New Subspecies
Long, Charles Alan
358 Gutenberg downloadsen2010Difficulty 51 (Graduate)
A New Bat (Myotis) From Mexico
Hall, E. Raymond (Eugene Raymond)
357 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Fossil Butterflies Memoirs of the American Association for the Advancement of Science, I.
Scudder, Samuel Hubbard
357 Gutenberg downloadsen2017Difficulty 59 (Graduate)
Taxonomy of the Chipmunks, Eutamias quadrivittatus and Eutamias umbrinus
White, John A.
357 Gutenberg downloadsen2010Difficulty 54 (Graduate)
The Kansas University Quarterly, Vol. I, No. 1 (1892)
Various
357 Gutenberg downloadsen2017Difficulty 58 (Graduate)
The Methods and Scope of Genetics An inaugural lecture delivered 23 October 1908
Bateson, William
357 Gutenberg downloadsen2016Difficulty 60 (Graduate)
Thoughts on General and Partial Inoculations Containing a translation of two treatises written when the author was at Petersburg, and published there, by Command of her Imperial Majesty, in the Russian Language
Dimsdale, Thomas
357 Gutenberg downloadsen2015Difficulty 67 (Academic)
Degeneration: A Chapter in Darwinism
Lankester, E. Ray (Edwin Ray), Sir
355 Gutenberg downloadsen2019Difficulty 66 (Academic)
Florulae Insularum Australium Prodromus
Forster, Georg
355 Gutenberg downloadsla2011
Het Leven der Dieren: Deel 1, Hoofdstuk 07: De Knaagdieren
Brehm, Alfred Edmund
355 Gutenberg downloadsnl2007
Type specimens of amphibians and reptiles in the Museum of Natural History, the University of Kansas
Duellman, William Edward & Berg, Barbara
355 Gutenberg downloadsen2024Difficulty 56 (Graduate)
Additions to the List of the Birds of Louisiana
Lowery, George H., Jr.
354 Gutenberg downloadsen2010Difficulty 61 (Academic)
Humboldt From 'The Gods and Other Lectures'
Ingersoll, Robert Green
354 Gutenberg downloadsen2011Difficulty 62 (Academic)
A New Bat (Genus Leptonycteris) From Coahuila
Stains, Howard J.
353 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Comments on the Taxonomy and Geographic Distribution of Some North American Rabbits
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
353 Gutenberg downloadsen2009Difficulty 58 (Graduate)
Evolution Social and Organic
Lewis, Arthur M. (Arthur Morrow)
353 Gutenberg downloadsen2018Difficulty 57 (Graduate)
Mushrooms of America, Edible and Poisonous
Unknown
353 Gutenberg downloadsen2009Difficulty 49 (College)
Poisonous Dwellers of the Desert
Dodge, Natt N. (Natt Noyes)
353 Gutenberg downloadsen2017Difficulty 61 (Academic)
Roses: or, a Monograph of the Genus Rosa
Andrews, Henry Cranke, active 1799-1828
353 Gutenberg downloadsen2021Difficulty 63 (Academic)
The apiary; or, bees, bee-hives, and bee culture [1866] Being a familiar account of the habits of bees, and the most improved methods of management, with full directions, adapted for the cottager, farmer, or scientific apiarian
Neighbor, Alfred
353 Gutenberg downloadsen2022Difficulty 59 (Graduate)
Emanuel Swedenborg's Investigations in Natural Science and the Basis for His Statements Concerning the Functions of the Brain
Ramström, Martin
352 Gutenberg downloadsen2020Difficulty 71 (Expert)
Fishes of the Wakarusa River in Kansas
Deacon, James E. & Metcalf, Artie L.
352 Gutenberg downloadsen2010Difficulty 45 (College)
Warum wir sterben
Lipschütz, Alejandro
352 Gutenberg downloadsde2008
A New Species of Heteromyid Rodent from the Middle Oligocene of Northeast Colorado with Remarks on the Skull
Galbreath, Edwin C. (Edwin Carter)
351 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Reise in die Aequinoctial-Gegenden des neuen Continents. Band 4.
Humboldt, Alexander von
351 Gutenberg downloadsde2012
Saunders' Books on Pathology, Physiology Histology, Embryology and Bacteriology
W.B. Saunders Company
351 Gutenberg downloadsen2017Difficulty 61 (Academic)
The preparation & mounting of microscopic objects
Davies, Thomas
351 Gutenberg downloadsen2019Difficulty 53 (Graduate)
A New Bat (Genus Myotis) From Mexico
Dalquest, Walter Woelber & Hall, E. Raymond (Eugene Raymond)
350 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Evolution
Watson, James A. S. (James Anderson Scott)
350 Gutenberg downloadsen2016Difficulty 60 (Graduate)
Notes on Veterinary Anatomy
Korinek, Charles James
350 Gutenberg downloadsen2019Difficulty 53 (Graduate)
The American Bee Journal, Vol. VI., Number 5, November 1870
Various
350 Gutenberg downloadsen2018Difficulty 53 (Graduate)
Time and Life: Mr. Darwin's "Origin of Species"
Huxley, Thomas Henry
350 Gutenberg downloadsen2001Difficulty 72 (Expert)
A New Pocket Gopher (Thomomys) and A New Spiny Pocket Mouse (Liomys) from Michoacán, Mexico
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349 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Descriptions of Two Species of Frogs, Genus Ptychohyla Studies of American Hylid Frogs, V
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349 Gutenberg downloadsen2010Difficulty 59 (Graduate)
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349 Gutenberg downloadsen2010Difficulty 55 (Graduate)
A New Subspecies of the Fruit-eating Bat, Sturnira ludovici, From Western Mexico
Jones, J. Knox & Phillips, Gary L.
348 Gutenberg downloadsen2010Difficulty 55 (Graduate)
An Expository Outline of the "Vestiges of the Natural History of Creation" With a Notice of the Author's "Explanations:" A Sequel to the Vestiges
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348 Gutenberg downloadsen2006Difficulty 66 (Academic)
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348 Gutenberg downloadsde2016
Bedenkingen tegen de Leer van Darwin Gevolgd door beschouwingen over eenige philosophische onderwerpen.
Reuther, Antoine Charles
348 Gutenberg downloadsnl2009
Experimentelle Untersuchungen über die Frage »Ist die Furcht vor Krankheitsübertragung durch das Telephon berechtigt«? Inaugural-Dissertation zur Erlangung der Doktorwürde in der Medizin, Chirurgie und Geburtshülfe der Hohen Medizinischen Fakultät der Königlichen Universität Greifswald
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348 Gutenberg downloadsde2008
Notes on Philippine Birds Collected by Governor W. Cameron Forbes Bulletin of the Museum of Comparative Zoölogy at Harvard College, Vol. LXV. No. 4.
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348 Gutenberg downloadsen2011Difficulty 49 (College)
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Harvie-Brown, J. A. (John Alexander) & Barrington, Richard Manliffe & Clarke, William Eagle & Cordeaux, John & More, Alexander Goodman
348 Gutenberg downloadsen2021Difficulty 43 (College)
The Mammals of Warren Woods, Berrien County, Michigan Occasional Paper of the Museum of Zoology, Number 86
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348 Gutenberg downloadsen2010Difficulty 49 (College)
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348 Gutenberg downloadsen2009Difficulty 51 (Graduate)
A Preliminary Revision of the North American Species of Cactus, Anhalonium, and Lophophora
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347 Gutenberg downloadsen1998Difficulty 56 (Graduate)
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347 Gutenberg downloadsen2018Difficulty 56 (Graduate)
Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 The Ascomycetes of Ohio IV and V
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347 Gutenberg downloadsen2006Difficulty 58 (Graduate)
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347 Gutenberg downloadsen2010Difficulty 58 (Graduate)
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Fiske, John
347 Gutenberg downloadsen2004Difficulty 62 (Academic)
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Jenkinson, Marion Anne
347 Gutenberg downloadsen2010Difficulty 64 (Academic)
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346 Gutenberg downloadsen2010Difficulty 62 (Academic)
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346 Gutenberg downloadsen2017Difficulty 66 (Academic)
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346 Gutenberg downloadsen2014Difficulty 54 (Graduate)
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346 Gutenberg downloadsnl2008
Geographic Variation in the Pocket Gopher, Cratogeomys castanops, in Coahuila, México
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346 Gutenberg downloadsen2010Difficulty 64 (Academic)
The Birds of Australia, Vol. 3 of 7
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346 Gutenberg downloadsen2019Difficulty 61 (Academic)
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345 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Pleistocene Soricidae from San Josecito Cave, Nuevo Leon, Mexico
Findley, James S. (James Smith)
344 Gutenberg downloadsen2010Difficulty 58 (Graduate)
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Ellsworth, Rodney Sydes
344 Gutenberg downloadsen2025Difficulty 56 (Graduate)
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Williston, Samuel Wendell
344 Gutenberg downloadsen2022Difficulty 63 (Academic)
A Synopsis of the British Mosses Containing Descriptions of All the Genera and Species, (With Localities of the Rarer Ones) Found in Great Britain and Ireland, Based Upon Wilson's "Bryologia Britannica," Schimper's "Synopsis," Etc.
Hobkirk, Charles C. P. (Charles Codrington Pressick)
342 Gutenberg downloadsen2021Difficulty 63 (Academic)
Report on the Migration of Birds in the Spring and Autumn of 1883. Fifth Report
Harvie-Brown, J. A. (John Alexander) & Barrington, Richard Manliffe & Cordeaux, John & More, Alexander Goodman
342 Gutenberg downloadsen2021Difficulty 44 (College)
The Baculum in Microtine Rodents
Anderson, Sydney
342 Gutenberg downloadsen2011Difficulty 65 (Academic)
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Blumenbach, Johann Friedrich
342 Gutenberg downloadsde2020
De afstamming van den mensch Naar voordrachten in populair-wetenschappelijken vorm bewerkt
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341 Gutenberg downloadsnl2017
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341 Gutenberg downloadsnl2006
Het Leven der Dieren: Hoofdstuk 8: De Vinduikers; Hoofdstuk 9: de Stormvogels
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341 Gutenberg downloadsnl2010
Subspeciation in the Meadow Mouse, Microtus pennsylvanicus, in Wyoming, Colorado, and Adjacent Areas
Anderson, Sydney
341 Gutenberg downloadsen2010Difficulty 61 (Academic)
The attitudes of animals in motion, illustrated with the zoopraxiscope
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341 Gutenberg downloadsen2011Difficulty 59 (Graduate)
Cruise of the Revenue-Steamer Corwin in Alaska and the N.W. Arctic Ocean in 1881: Botanical Notes Notes and Memoranda: Medical and Anthropological; Botanical; Ornithological.
Muir, John
340 Gutenberg downloadsen2010Difficulty 54 (Graduate)
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Anderson, Sydney
340 Gutenberg downloadsen2010Difficulty 51 (Graduate)
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340 Gutenberg downloadsla2012
Researches on the Visual Organs of the Trilobites
Lindström, Gustaf
340 Gutenberg downloadsen2022Difficulty 54 (Graduate)
Section-Cutting A Practical Guide to the Preparation and Mounting of Sections for the Microscope, Special Prominence Being given to the Subject of Animal Sections
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340 Gutenberg downloadsen2017Difficulty 61 (Academic)
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340 Gutenberg downloadsen2001Difficulty 69 (Academic)
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340 Gutenberg downloadsen2015Difficulty 74 (Expert)
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Supplement to Harvesting Ants and Trap-Door Spiders
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339 Gutenberg downloadsen2021Difficulty 59 (Graduate)
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Andrews, Henry Cranke, active 1799-1828
339 Gutenberg downloadsen2023Difficulty 56 (Graduate)
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Edridge-Green, F. W. (Frederick William)
339 Gutenberg downloadsen2025Difficulty 56 (Graduate)
The O. S. U. Naturalist, Vol. 1, No. 1, November, 1900
Ohio State University. Biological Club
339 Gutenberg downloadsen2017Difficulty 56 (Graduate)
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339 Gutenberg downloadsen2018Difficulty 67 (Academic)
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338 Gutenberg downloadsen2015Difficulty 66 (Academic)
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338 Gutenberg downloadsnl2007
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338 Gutenberg downloadsen2025Difficulty 72 (Expert)
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338 Gutenberg downloadsen2019Difficulty 69 (Academic)
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338 Gutenberg downloadsen2010Difficulty 61 (Academic)
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337 Gutenberg downloadsen2023Difficulty 62 (Academic)
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337 Gutenberg downloadsen2024Difficulty 63 (Academic)
The Nautilus. Vol. XXXI, No. 2, October 1917 A Quarterly Journal Devoted to the Interests of Conchologists
Various
337 Gutenberg downloadsen2019Difficulty 52 (Graduate)
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336 Gutenberg downloadsen2009Difficulty 56 (Graduate)
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336 Gutenberg downloadsit2005
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336 Gutenberg downloadsen2021Difficulty 61 (Academic)
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336 Gutenberg downloadsen2021Difficulty 31 (High School)
The Ohio naturalist, Vol. 1, No. 4, February 1901
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336 Gutenberg downloadsen2022Difficulty 49 (College)
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335 Gutenberg downloadsen2016Difficulty 75 (Expert)
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335 Gutenberg downloadsen2011Difficulty 66 (Academic)
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335 Gutenberg downloadsde2015
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335 Gutenberg downloadsde2013
Observations on the Mississippi Kite in Southwestern Kansas
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335 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Report on the Migration of Birds in the Autumn of 1879. [First Report]
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335 Gutenberg downloadsen2021Difficulty 40 (High School)
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334 Gutenberg downloadsen2009Difficulty 58 (Graduate)
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334 Gutenberg downloadsde2024
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334 Gutenberg downloadspt2012
The Philosophy of Evolution Together With a Preliminary Essay on The Metaphysical Basis of Science
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334 Gutenberg downloadsen2009Difficulty 64 (Academic)
Dissertatio inauguralis physico-medica de respiratione quam consensu & auctoritate gratiosissimi medicorum ordinis in universitate patria pro summis in arte medica honoribus & privilegiis doctoralibus rite consequendis....
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333 Gutenberg downloadsla2013
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333 Gutenberg downloadsen2011
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Various
333 Gutenberg downloadsen2015Difficulty 56 (Graduate)
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333 Gutenberg downloadsen2014Difficulty 54 (Graduate)
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333 Gutenberg downloadsfi2021
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332 Gutenberg downloadsnl2007
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Dawson, John William, Sir
332 Gutenberg downloadsen2022Difficulty 58 (Graduate)
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331 Gutenberg downloadsen2021Difficulty 56 (Graduate)
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331 Gutenberg downloadsen2024Difficulty 65 (Academic)
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Various
331 Gutenberg downloadsen2009Difficulty 77 (Expert)
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331 Gutenberg downloadsen2019Difficulty 69 (Academic)
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331 Gutenberg downloadsen2018Difficulty 44 (College)
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330 Gutenberg downloadsen2021Difficulty 52 (Graduate)
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330 Gutenberg downloadsen2021Difficulty 47 (College)
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328 Gutenberg downloadsfr2006
Die Protozoen als Krankheitserreger des Menschen und der Hausthiere Für Ärzte, Thierärzte und Zoologen
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328 Gutenberg downloadsde2016
Taxonomic Status of Some Mice of The Peromyscus boylii Group in Eastern Mexico, With Description of a New Subspecies
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327 Gutenberg downloadsen2011Difficulty 54 (Graduate)
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327 Gutenberg downloadsde2022
Two New Meadow Mice from Michoacán Mexico
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327 Gutenberg downloadsen2010Difficulty 60 (Graduate)
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326 Gutenberg downloadsde2014
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326 Gutenberg downloadsen2016
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326 Gutenberg downloadsen2013Difficulty 54 (Graduate)
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326 Gutenberg downloadsen2005Difficulty 58 (Graduate)
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325 Gutenberg downloadsen2010Difficulty 63 (Academic)
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325 Gutenberg downloadsen2019Difficulty 58 (Graduate)
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325 Gutenberg downloadsen2018Difficulty 65 (Academic)
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325 Gutenberg downloadsnl2006
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325 Gutenberg downloadsen2023Difficulty 51 (Graduate)
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324 Gutenberg downloadsen2010Difficulty 56 (Graduate)
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324 Gutenberg downloadsen2010Difficulty 57 (Graduate)
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324 Gutenberg downloadsfr2017
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324 Gutenberg downloadsen2010Difficulty 52 (Graduate)
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324 Gutenberg downloadsen2010Difficulty 50 (College)
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324 Gutenberg downloadsen2010
The Book of Shells Containing the Classes Mollusca, Conchifera, Cirrhipeda, Annulata, and Crustacea
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324 Gutenberg downloadsen2019Difficulty 64 (Academic)
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324 Gutenberg downloadsen2009Difficulty 59 (Graduate)
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323 Gutenberg downloadsen2007Difficulty 55 (Graduate)
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323 Gutenberg downloadsen2025Difficulty 66 (Academic)
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323 Gutenberg downloadsen2025Difficulty 48 (College)
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322 Gutenberg downloadsen2022Difficulty 69 (Academic)
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321 Gutenberg downloadsen2016Difficulty 88 (Specialist)
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321 Gutenberg downloadsen2010Difficulty 53 (Graduate)
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320 Gutenberg downloadsen2024Difficulty 66 (Academic)
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320 Gutenberg downloadsnl2006
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319 Gutenberg downloadsen2023Difficulty 67 (Academic)
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318 Gutenberg downloadsen2021Difficulty 63 (Academic)
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318 Gutenberg downloadsen2011Difficulty 60 (Graduate)
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318 Gutenberg downloadsen2010Difficulty 62 (Academic)
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317 Gutenberg downloadsen2022Difficulty 59 (Graduate)
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317 Gutenberg downloadsen2010Difficulty 55 (Graduate)
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317 Gutenberg downloadsen2008Difficulty 53 (Graduate)
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316 Gutenberg downloadsen2010Difficulty 60 (Graduate)
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316 Gutenberg downloadsnl2014
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316 Gutenberg downloadsen2019Difficulty 50 (College)
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315 Gutenberg downloadsen2010Difficulty 51 (Graduate)
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315 Gutenberg downloadsen2021Difficulty 71 (Expert)
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314 Gutenberg downloadsnl2005
A New Piñon Mouse (Peromyscus truei) from Durango, Mexico
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313 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Bees from British Guiana Bulletin of the AMNH, Vol. XXXVIII, Art. XX, pp. 685-690
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313 Gutenberg downloadsen2023Difficulty 70 (Academic)
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313 Gutenberg downloadsde2015
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313 Gutenberg downloadsen2022Difficulty 52 (Graduate)
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313 Gutenberg downloadsen2023Difficulty 56 (Graduate)
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312 Gutenberg downloadsen2019Difficulty 55 (Graduate)
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312 Gutenberg downloadsen2010Difficulty 60 (Graduate)
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Doumet-Adanson, Napoléon
312 Gutenberg downloadsfr2024
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312 Gutenberg downloadsfi2005
A Guide for the Dissection of the Dogfish (Squalus Acanthias)
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311 Gutenberg downloadsen2019Difficulty 54 (Graduate)
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Chapman, Frank M. (Frank Michler)
311 Gutenberg downloadsen2025Difficulty 50 (College)
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311 Gutenberg downloadsen2022Difficulty 60 (Graduate)
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311 Gutenberg downloadsen2010Difficulty 46 (College)
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311 Gutenberg downloadsen2010Difficulty 55 (Graduate)
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310 Gutenberg downloadsen2025Difficulty 63 (Academic)
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308 Gutenberg downloadsla2008
Der Tabak: Studien über seine Kultur und Biologie
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308 Gutenberg downloadsde2016
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307 Gutenberg downloadsen2011Difficulty 55 (Graduate)
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Unknown
307 Gutenberg downloadspt2005
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307 Gutenberg downloadsen2023Difficulty 66 (Academic)
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307 Gutenberg downloadsen2023Difficulty 52 (Graduate)
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307 Gutenberg downloadsen2010
An Estimate of the True Value of Vaccination as a Security Against Small Pox
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306 Gutenberg downloadsen2015Difficulty 70 (Academic)
Coloured engravings of heaths; vol. 4
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306 Gutenberg downloadsen2023Difficulty 60 (Graduate)
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306 Gutenberg downloadsen2020Difficulty 65 (Academic)
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306 Gutenberg downloadsen2024Difficulty 54 (Graduate)
The Ohio naturalist, Vol. 1, No. 8, June 1901
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306 Gutenberg downloadsen2022Difficulty 51 (Graduate)
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305 Gutenberg downloadsen2025Difficulty 55 (Graduate)
The Bedbug [1934]
Marlatt, C. L.
305 Gutenberg downloadsen2020Difficulty 62 (Academic)
Leprosy : $b in its clinical & pathological aspects
Hansen, G. Armauer (Gerhard Armauer) & Looft, Carl
304 Gutenberg downloadsen2023Difficulty 64 (Academic)
Meeresfische
Floericke, Kurt
304 Gutenberg downloadsde2018
A New Bog Lemming (Genus Synaptomys) From Nebraska
Jones, J. Knox
303 Gutenberg downloadsen2010Difficulty 62 (Academic)
Some Common Birds Useful to the Farmer (1915 edition)
Beal, F. E. L. (Foster Ellenborough Lascelles)
302 Gutenberg downloadsen2020Difficulty 54 (Graduate)
Rapport sur un voyage botanique en Algérie, de Philippeville à Biskra et dans les Monts Aurès, entrepris en 1853 sous le patronage du Ministère de la guerre
Cosson, E. (Ernest)
301 Gutenberg downloadsfr2024
Some Common Birds in Their Relation to Agriculture
Beal, F. E. L. (Foster Ellenborough Lascelles)
300 Gutenberg downloadsen2020Difficulty 55 (Graduate)
The American Apiculturist. Vol. III. No. 6, June 15, 1885 A Journal Devoted to Scientific and Practical Beekeeping
Various
300 Gutenberg downloadsen2018Difficulty 54 (Graduate)
Zwischen Pol und Äquator: Tiergeographische Lebensbilder
Floericke, Kurt
300 Gutenberg downloadsde2022
De Plantis Esculentis Insularum Oceani Australis Commentatio Botanica
Forster, Georg
299 Gutenberg downloadsla2011
The Ohio Naturalist, Vol. II, No. 1, November, 1901
Ohio State University. Biological Club
299 Gutenberg downloadsen2023Difficulty 53 (Graduate)
Neotropical Bats from Western México
Anderson, Sydney
298 Gutenberg downloadsen2010
Die krankheiterregenden Bakterien Entstehung, Heilung und Bekämpfung der bakteriellen Infektionskrankheiten des Menschen
Löhlein, Max
297 Gutenberg downloadsde2017
The botanist's repository for new and rare plants; vol. 05 [of 10]
Andrews, Henry Cranke, active 1799-1828
296 Gutenberg downloadsen2024Difficulty 55 (Graduate)
The heathery; or, A monograph of the genus Erica. vol. 6
Andrews, Henry Cranke, active 1799-1828
296 Gutenberg downloadsen2023Difficulty 58 (Graduate)
The Periodical Cicada, "the 17-year Locust"
United States. Department of Agriculture
296 Gutenberg downloadsen2019Difficulty 51 (Graduate)
A természettudomány fejlődésének története (1. kötet)
Bölsche, Wilhelm
295 Gutenberg downloadshu2022
Flytraps and Their Operation [1930]
Bishopp, F. C. (Fred Corry)
295 Gutenberg downloadsen2020Difficulty 51 (Graduate)
The Ohio naturalist, Vol. 1, No. 3, January, 1901
Ohio State University. Biological Club
295 Gutenberg downloadsen2023Difficulty 53 (Graduate)
Études sur la flore du Sénégal
Vallot, Joseph
295 Gutenberg downloadsfr2024
Het Leven der Dieren: Deel 3.9, De Oerdieren
Brehm, Alfred Edmund
294 Gutenberg downloadsnl2021
The Fern Bulletin, October 1903 A Quarterly Devoted to Ferns
Various
294 Gutenberg downloadsen2018Difficulty 50 (College)
A New Subspecies of Ground Squirrel (Spermophilus spilosoma) from Tamaulipas, Mexico
Alvarez, Ticul
293 Gutenberg downloadsen2011
The Virtue and Use of Coffee With Regard to the Plague and Other Infectious Distempers
Bradley, Richard
293 Gutenberg downloadsen2019Difficulty 63 (Academic)
Desert and water gardens of the Red Sea : $b Being an account of the natives and the shore formations of the coast
Crossland, Cyril
292 Gutenberg downloadsen2023Difficulty 50 (College)
L'intelligence des fleurs
Maeterlinck, Maurice
292 Gutenberg downloadsfr2020
Mammals from Southeastern Alaska
Baker, Rollin H. (Rollin Harold) & Findley, James S. (James Smith)
292 Gutenberg downloadsen2010
Sciências Naturaes Pela Redacção da «Educação Nacional»
Anonymous
292 Gutenberg downloadspt2006
On The Affinities of Leptarctus primus of Leidy American Museum of Natural History, Vol. VI, Article VIII, pp. 229-331.
Wortman, Jacob Lawson
291 Gutenberg downloadsen2008
An Account of the Sore Throat Attended With Ulcers A Disease Which Hath of Late Years Appeared in This City, and in Several Parts of the Nation
Fothergill, John
290 Gutenberg downloadsen2017Difficulty 67 (Academic)
Aus dem Leben der Insekten
Buckley, Arabella B. (Arabella Burton)
290 Gutenberg downloadsde2022
House Flies
Howard, L. O. (Leland Ossian)
290 Gutenberg downloadsen2019Difficulty 56 (Graduate)
Dairy Disagreeables Busy the Bacteriologists
Hall, Frank H. (Frank Henry) & Harding, Harry Alexis & Rogers, L. A. (Lore Alford) & Smith, George A.
289 Gutenberg downloadsen2022Difficulty 56 (Graduate)
Het Leven der Dieren: Deel 2, Hoofdstuk 02: De Papegaaien; Hoofdstuk 03: De Duifvogels
Brehm, Alfred Edmund
289 Gutenberg downloadsnl2009
Catalogue of the dipterous insects collected at Singapore and Malacca
Wallace, Alfred Russel
287 Gutenberg downloadsen2023Difficulty 56 (Graduate)
A study of mushrooms and mushroom spawn
Jacob, Edward Henry
286 Gutenberg downloadsen2023Difficulty 50 (College)
A study of some factors influencing fertility and sterility in the bull
Gilman, Herbert Lester
286 Gutenberg downloadsen2024Difficulty 67 (Academic)
Notes on Diseases of Cattle: Cause, Symptoms and Treatment
Korinek, Charles James
286 Gutenberg downloadsen2019Difficulty 55 (Graduate)
Tadarida femorosacca (Merriam) in Tamaulipas, Mexico
Dalquest, Walter Woelber & Hall, E. Raymond (Eugene Raymond)
286 Gutenberg downloadsen2010Difficulty 53 (Graduate)
The O. S. U. Naturalist, Vol. 1, No. 2, December, 1900
Ohio State University. Biological Club
285 Gutenberg downloadsen2023Difficulty 52 (Graduate)
The Florist and Horticultural Journal, Vol. II. No. 7, July, 1853 A Monthly Magazine of Horticulture, Agriculture, Botany, Agricultural Chemistry, Entomology, &c.
Various
284 Gutenberg downloadsen2018Difficulty 55 (Graduate)
Het paard : $b in zijne natuurlijke ontwikkeling
Bölsche, Wilhelm
283 Gutenberg downloadsnl2025
Pecan Diseases and Pests and Their Control
Rosburg, David W. & King, D. R.
283 Gutenberg downloadsen2021Difficulty 64 (Academic)
The Bedbug [1916]
Marlatt, C. L.
283 Gutenberg downloadsen2020Difficulty 61 (Academic)
Inferences from Haunted Houses and Haunted Men
Harris, J. W. (John William)
280 Gutenberg downloadsen2004Difficulty 50 (College)
The bedbug : $b Its relation to public health, its habits and life history, and methods of control
United States. Public Health Service
280 Gutenberg downloadsen2023Difficulty 60 (Graduate)
Distribution of Some Nebraskan Mammals
Jones, J. Knox
279 Gutenberg downloadsen2010
Sweet-Clover Seed
Coe, H. S. & Martin, John N. (John Nathan)
278 Gutenberg downloadsen2020Difficulty 60 (Graduate)
The heathery; or, A monograph of the genus Erica. vol. 2
Andrews, Henry Cranke, active 1799-1828
278 Gutenberg downloadsen2023Difficulty 54 (Graduate)
Uit de dierenwereld van het water Schetsen in woord en beeld van het lever der lagere diersoorten
Snijders, A. J. C. (Anthony J. C.)
278 Gutenberg downloadsnl2022
Wintering Bees in Cellars
Phillips, Everett Franklin & Demuth, Geo. S. (George S.)
278 Gutenberg downloadsen2019Difficulty 52 (Graduate)
Coloured engravings of heaths; vol. 1
Andrews, Henry Cranke, active 1799-1828
277 Gutenberg downloadsen2023Difficulty 60 (Graduate)
Darwinism. The Noachian Flood A lecture delivered before the Torquay Natural History Society, Jan. 31st, 1870
Stebbing, Thomas Roscoe Rede
277 Gutenberg downloadsen2021Difficulty 68 (Academic)
Two New Moles (Genus Scalopus) from Mexico and Texas
Baker, Rollin H. (Rollin Harold)
277 Gutenberg downloadsen2010Difficulty 56 (Graduate)
Which Shall Live—Men or Animals?
Baynes, Ernest Harold
277 Gutenberg downloadsen2021Difficulty 61 (Academic)
Flytraps and Their Operation [1921]
Bishopp, F. C. (Fred Corry)
276 Gutenberg downloadsen2020Difficulty 48 (College)
Het Leven der Dieren, Deel 3, Hoofdstuk 5: De Spinachtigen
Brehm, Alfred Edmund
276 Gutenberg downloadsnl2020
Irritability : $b a physiological analysis of the general effect of stimuli in living substance
Verworn, Max
275 Gutenberg downloadsen2021Difficulty 65 (Academic)
Nitrogen Bacteria and Legumes With special reference to red clover, cowpeas, soy beans, alfalfa, and sweet clover, on Illinois soils
Hopkins, Cyril G. (Cyril George)
274 Gutenberg downloadsen2018Difficulty 58 (Graduate)
The little book of British quadrupeds
May, W.
274 Gutenberg downloadsen2024Difficulty 44 (College)
Hints on the History and Management of the Honey Bee Being the Substance of Two Lectures Read Before the Members of the Hereford Literary, Philosophical, and Antiquarian Institution, in the Winter of 1850-51
Bevan, Edward
273 Gutenberg downloadsen2022Difficulty 64 (Academic)
The Kansas University Science Bulletin (Vol. I, No. 1)
Various
272 Gutenberg downloadsen2017Difficulty 50 (College)
A Defence of the Inquiry into Mesmerism & Phrenology chiefly in relation to recent events in Lynn
Armes, William
270 Gutenberg downloadsen2017Difficulty 66 (Academic)
Supplement to the catalogue of seals and whales in the British Museum
Gray, John Edward
269 Gutenberg downloadsen2023Difficulty 45 (College)
A synopsis of the palms of Puerto Rico
Cook, O. F. (Orator Fuller)
267 Gutenberg downloadsen2023Difficulty 63 (Academic)
A Statement of Facts Tending to Establish an Estimate of the True Value and Present State of Vaccination
Blane, Gilbert, Sir
265 Gutenberg downloadsen2022Difficulty 67 (Academic)
Das Protoplasma der Rhizopoden und der Pflanzenzellen ein Beitrag zur Theorie der Zelle
Schultze, Max
265 Gutenberg downloadsde2022
The Ohio Journal of Science, Vol. XVI, No. 1, November 1915
Various
265 Gutenberg downloadsen2017Difficulty 50 (College)
Some Common Birds Useful to the Farmer (1926 edition)
Beal, F. E. L. (Foster Ellenborough Lascelles)
264 Gutenberg downloadsen2020Difficulty 55 (Graduate)
Poultry diseases Causes, symptoms and treatment, with notes on post-mortem examinations
Wortley, E. J. (E. Jocelyn)
259 Gutenberg downloadsen2022Difficulty 57 (Graduate)
Säugethiere vom Celebes- und Philippinen-Archipel
Meyer, Adolf Bernhard
259 Gutenberg downloadsde2023
The Kansas University Science Bulletin, Vol. I, No. 2, February, 1902
Various
259 Gutenberg downloadsen2017Difficulty 52 (Graduate)
The Ohio Naturalist, vol. II, no. 2, December, 1901
Ohio State University. Biological Club
257 Gutenberg downloadsen2023Difficulty 64 (Academic)
Pleistocene Pocket Gophers From San Josecito Cave, Nuevo Leon, Mexico
Russell, Robert J.
256 Gutenberg downloadsen2010
Mushroom and Toadstools How to Distinguish Easily the Differences Between Edible and Poisonous Fungi
Smith, Worthington George
254 Gutenberg downloadsen2019Difficulty 49 (College)
Bananas: Nature's Institution for the Promotion of Laziness
Perry, Edward Wilkin
252 Gutenberg downloadsen2017Difficulty 52 (Graduate)
A Letter on Suspended Animation containing experiments shewing that it may be safely employed during operations on animals
Hickman, Henry Hill
250 Gutenberg downloadsen2018Difficulty 77 (Expert)
L'idée médicale dans les romans de Paul Bourget
Grasset, J. (Joseph)
249 Gutenberg downloadsfr2019
The Ohio Naturalist, Vol. I, No. 7, May, 1901
Ohio State University. Biological Club
249 Gutenberg downloadsen2023Difficulty 51 (Graduate)
George Washington Carver National Monument Junior Ranger Activity Book: The Scientist
United States. National Park Service
246 Gutenberg downloadsen2020Difficulty 49 (College)
Identifying Hardwoods Growing on Pine Sites
Brown, Clair A. (Clair Alan) & Grelen, Harold E.
241 Gutenberg downloadsen2021Difficulty 54 (Graduate)
Reprint of Two Tracts 1. An essay on gleets. 2. An enquiry into the nature, cause, and cure of a singular disease of the eyes
Marat, Jean Paul
238 Gutenberg downloadsen2018Difficulty 56 (Graduate)
The illustrated story of evolution
Gauvin, Marshall J. (Marshall Jerome)
238 Gutenberg downloadsen2023Difficulty 54 (Graduate)
The Kansas University science bulletin, Vol. I, No. 8, September 1902
Unknown
238 Gutenberg downloadsen2023
The heathery; or, A monograph of the genus Erica. vol. 5
Andrews, Henry Cranke, active 1799-1828
237 Gutenberg downloadsen2023
Case of Filaria loa
Robertson, Douglas Argyll
224 Gutenberg downloadsen2023Difficulty 50 (College)
The Canadian Entomologist, Vol. XII., No. 2, February 1880
Various
212 Gutenberg downloadsen2018
An Attempt to Investigate the Seat of Animal Life
Curtis, Henry
152 Gutenberg downloadsen2021Difficulty 71 (Expert)

Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.

The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.

Life and Letters of Charles Darwin — Volume 1

More Letters of Charles Darwin — Volume 1 A Record of His Work in a Series of Hitherto Unpublished Letters

On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition)

The Variation of Animals and Plants Under Domestication, Vol. I.

The Notebooks of Leonardo Da Vinci — Complete

Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants

Darwin, and After Darwin, Volumes 1 and 3 An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions

Contributions to the Theory of Natural Selection A Series of Essays

Cattle and Their Diseases Embracing Their History and Breeds, Crossing and Breeding, and Feeding and Management; with the Diseases to Which They Are Subject, and the Remedies Best Adapted to Their Cure

The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality

The Natural History of Pliny, Volume 3 (of 6)

On the Origin of Species By Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life

Mysteries of Bee-keeping Explained

The Origin of Species by Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition

Evolution, Old & New Or, the Theories of Buffon, Dr. Erasmus Darwin and Lamarck, as compared with that of Charles Darwin

Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases

Letters of Asa Gray; Vol. 2

The Foundations of the Origin of Species Two Essays written in 1842 and 1844

The Medicinal Plants of the Philippines

Birds of the Rockies

Delineations of the Ox Tribe: The Natural History of Bulls, Bisons, and Buffaloes. Exhibiting all the Known Species and the More Remarkable Varieties of the Genus Bos.

Zoölogische Philosophie Of beschouwingen over de Natuurlijke Historie der dieren etc.

The Dawn of Reason; or, Mental Traits in the Lower Animals

Sir Jagadis Chunder Bose, His Life and Speeches

Man And His Ancestor: A Study In Evolution

Outlines of Dairy Bacteriology, 8th edition A Concise Manual for the Use of Students in Dairying

Species Plantarum, Sections IV-V

Explanation of Terms Used in Entomology

Makers of British Botany; a collection of biographies by living botanists

Evolution in Modern Thought

An Elementary Study of Insects

The Stock-Feeder's Manual the chemistry of food in relation to the breeding and feeding of live stock

Rollo's Experiments

Freedom in Science and Teaching. from the German of Ernst Haeckel

At the Deathbed of Darwinism: A Series of Papers

Life and Matter: A Criticism of Professor Haeckel's "Riddle of the Universe"

Are the Effects of Use and Disuse Inherited? An Examination of the View Held by Spencer and Darwin

The Expression of the Emotions in Man and Animals

On Growth and Form

The Genus Pinus

The Variation of Animals and Plants under Domestication

The Voyage of the Beagle

Prof. Koch's Method to Cure Tuberculosis Popularly Treated

Handbook of Birmingham Prepared for the Members of the British Association, 1886

Mental Evolution in Man: Origin of Human Faculty

The Common Spiders of the United States

The Descent of Man, and Selection in Relation to Sex

Pharmacographia A history of the principal drugs of vegetable origin, met with in Great Britain and British India

The Animal Parasites of Man

Encyclopaedia Britannica, 11th Edition, "Echinoderma" to "Edward, prince of Wales" Volume 8, Slice 10

Aristotle's History of Animals In Ten Books

Scurvy, Past and Present

Herbal Simples Approved for Modern Uses of Cure

Travels in Peru and India While Superintending the Collection of Chinchona Plants and Seeds in South America, and Their Introduction into India.

Sketches of the Natural History of Ceylon

Toadstools, mushrooms, fungi, edible and poisonous; one thousand American fungi How to select and cook the edible; how to distinguish and avoid the poisonous, with full botanic descriptions. Toadstool poisons and their treatment, instructions to students, recipes for cooking, etc., etc.

The Moths of the British Isles, First Series Comprising the Families Sphingidæ to Noctuidæ

The book of wonders : $b gives plain and simple answers to the thousands of everyday questions that are asked and which all should be able to, but cannot answer...

The Natural History of Pliny, Volume 5 (of 6)

Beginners' zoology

Parasites: A Treatise on the Entozoa of Man and Animals Including Some Account of the Ectozoa

The Biotic Associations of Cockroaches

The Evolution of Man

Encyclopaedia Britannica, 11th Edition, "Foraminifera" to "Fox, Edward" Volume 10, Slice 6

The Cambridge natural history, Vol. 10 (of 10)

Origin of Cultivated Plants The International Scientific Series Volume XLVIII

The Story-book of Science

Micrographia Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with Observations and Inquiries Thereupon

Encyclopaedia Britannica, 11th Edition, "Matter" to "Mecklenburg" Volume 17, Slice 8

The Descent of Man and Selection in Relation to Sex, Vol. I

The Book of the Pearl The history, art, science, and industry of the queen of gems

Lamarck, the Founder of Evolution: His Life and Work

Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII

Australian insects

The Insect World Being a Popular Account of the Orders of Insects; Together with a Description of the Habits and Economy of Some of the Most Interesting Species

A system of practical medicine. By American authors. Vol. 1 : $b Pathology and general diseases

Butterflies and Moths (British)

Encyclopaedia Britannica, 11th Edition, "Ichthyology" to "Independence" Volume 14, Slice 3