Curated Shelf

Biology

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

1489 WorksDrawn from Project Gutenberg Bookshelf #669

Life and Letters of Charles Darwin — Volume 1
Darwin, Charles
30,219 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More Letters of Charles Darwin — Volume 1 A Record of His Work in a Series of Hitherto Unpublished Letters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
29,584 Gutenberg downloadsen2001Difficulty 50 (College)
The Natural History of Pliny, Volume 3 (of 6)
Pliny, the Elder
21,423 Gutenberg downloadsen2019Difficulty 38 (High School)
Letters of Asa Gray; Vol. 2
Gray, Asa
20,251 Gutenberg downloadsen2017Difficulty 47 (College)
The Notebooks of Leonardo Da Vinci — Complete
Leonardo, da Vinci
18,817 Gutenberg downloadsen2004Difficulty 52 (Graduate)
Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.
Atkinson, George Francis
18,806 Gutenberg downloadsen2008Difficulty 50 (College)
The elements of bacteriological technique : $b a laboratory guide for medical, dental, and technical students
Eyre, J. W. H. (John William Henry)
13,544 Gutenberg downloadsen2009Difficulty 59 (Graduate)
Contributions to the Theory of Natural Selection A Series of Essays
Wallace, Alfred Russel
13,227 Gutenberg downloadsen2007Difficulty 63 (Academic)
On the Origin of Species By Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life
Darwin, Charles
13,194 Gutenberg downloadsen1998Difficulty 61 (Academic)
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
Masters, Maxwell T. (Maxwell Tylden)
11,237 Gutenberg downloadsen2007Difficulty 61 (Academic)
The Variation of Animals and Plants Under Domestication, Vol. I.
Darwin, Charles
10,880 Gutenberg downloadsen2008Difficulty 67 (Academic)
Evolution, Old & New Or, the Theories of Buffon, Dr. Erasmus Darwin and Lamarck, as compared with that of Charles Darwin
Butler, Samuel
10,722 Gutenberg downloadsen2007Difficulty 57 (Graduate)
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
10,337 Gutenberg downloadsen2007Difficulty 67 (Academic)
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
9,850 Gutenberg downloadsen2007Difficulty 73 (Expert)
The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality
Schmid, Rudolf
8,627 Gutenberg downloadsen2007Difficulty 56 (Graduate)
Mysteries of Bee-keeping Explained
Quinby, M. (Moses)
8,619 Gutenberg downloadsen2008Difficulty 78 (Expert)
Birds of the Rockies
Keyser, Leander S. (Leander Sylvester)
7,518 Gutenberg downloadsen2008Difficulty 58 (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
7,358 Gutenberg downloadsen2009Difficulty 58 (Graduate)
The Origin of Species by Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition
Darwin, Charles
7,351 Gutenberg downloadsen1999Difficulty 65 (Academic)
Sir Jagadis Chunder Bose, His Life and Speeches
Bose, Jagadis Chandra
7,236 Gutenberg downloadsen2007Difficulty 65 (Academic)
The Medicinal Plants of the Philippines
Pardo de Tavera, T. H. (Trinidad Hermenegildo)
6,736 Gutenberg downloadsen2008Difficulty 67 (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
6,543 Gutenberg downloadsen2008Difficulty 55 (Graduate)
Man And His Ancestor: A Study In Evolution
Morris, Charles
6,471 Gutenberg downloadsen2009Difficulty 58 (Graduate)
The Dawn of Reason; or, Mental Traits in the Lower Animals
Weir, James, Jr.
6,087 Gutenberg downloadsen2007Difficulty 70 (Academic)
Evolution in Modern Thought
Unknown
5,752 Gutenberg downloadsen2007Difficulty 73 (Expert)
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
5,550 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Zoölogische Philosophie Of beschouwingen over de Natuurlijke Historie der dieren etc.
Lamarck, Jean Baptiste Pierre Antoine de Monet de
5,453 Gutenberg downloadsnl2008
The Stock-Feeder's Manual the chemistry of food in relation to the breeding and feeding of live stock
Cameron, Charles Alexander, Sir
5,048 Gutenberg downloadsen2008Difficulty 59 (Graduate)
An Elementary Study of Insects
Haseman, Leonard
4,957 Gutenberg downloadsen2007Difficulty 51 (Graduate)
Outlines of Dairy Bacteriology, 8th edition A Concise Manual for the Use of Students in Dairying
Russell, H. L. (Harry Luman)
4,836 Gutenberg downloadsen2009Difficulty 62 (Academic)
Freedom in Science and Teaching. from the German of Ernst Haeckel
Haeckel, Ernst
4,328 Gutenberg downloadsen2008Difficulty 73 (Expert)
Species Plantarum, Sections IV-V
Linné, Carl von
4,115 Gutenberg downloadsla2008
Explanation of Terms Used in Entomology
Smith, John Bernhard
3,995 Gutenberg downloadsen2007Difficulty 57 (Graduate)
The Foundations of the Origin of Species Two Essays written in 1842 and 1844
Darwin, Charles
3,727 Gutenberg downloadsen2007Difficulty 56 (Graduate)
Life and Matter: A Criticism of Professor Haeckel's "Riddle of the Universe"
Lodge, Oliver, Sir
3,417 Gutenberg downloadsen2008Difficulty 75 (Expert)
The Plants of Michigan Simple Keys for the Identification of the Native Seed Plants of the State
Gleason, Henry A. (Henry Allan)
3,257 Gutenberg downloadsen2010Difficulty 45 (College)
The Voyage of the Beagle
Darwin, Charles
3,016 Gutenberg downloadsen1997Difficulty 56 (Graduate)
The Genus Pinus
Shaw, George Russell
2,946 Gutenberg downloadsen2008Difficulty 58 (Graduate)
The Expression of the Emotions in Man and Animals
Darwin, Charles
2,899 Gutenberg downloadsen1998Difficulty 64 (Academic)
Are the Effects of Use and Disuse Inherited? An Examination of the View Held by Spencer and Darwin
Ball, W. P. (William Platt)
2,748 Gutenberg downloadsen2008Difficulty 68 (Academic)
Makers of British Botany; a collection of biographies by living botanists
Unknown
2,640 Gutenberg downloadsen2014Difficulty 61 (Academic)
The Descent of Man, and Selection in Relation to Sex
Darwin, Charles
2,475 Gutenberg downloadsen2000Difficulty 69 (Academic)
Prof. Koch's Method to Cure Tuberculosis Popularly Treated
Birnbaum, Max
2,423 Gutenberg downloadsen2008Difficulty 59 (Graduate)
Evolution and Classification of the Pocket Gophers of the Subfamily Geomyinae
Russell, Robert J.
2,402 Gutenberg downloadsen2012Difficulty 65 (Academic)
Rollo's Experiments
Abbott, Jacob
2,400 Gutenberg downloadsen2008Difficulty 35 (High School)
The Variation of Animals and Plants Under Domestication, Volume II (of 2)
Darwin, Charles
2,371 Gutenberg downloadsen2009Difficulty 73 (Expert)
Butterflies and Moths (British)
Furneaux, William S.
2,236 Gutenberg downloadsen2010Difficulty 44 (College)
On Growth and Form
Thompson, D'Arcy Wentworth
2,208 Gutenberg downloadsen2017Difficulty 53 (Graduate)
Identification of the Larger Fungi
Watling, Roy
1,894 Gutenberg downloadsen2019Difficulty 62 (Academic)
At the Deathbed of Darwinism: A Series of Papers
Dennert, Eberhard
1,865 Gutenberg downloadsen2007Difficulty 68 (Academic)
Herbal Simples Approved for Modern Uses of Cure
Fernie, William Thomas
1,843 Gutenberg downloadsen2006Difficulty 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
1,794 Gutenberg downloadsen2025Difficulty 48 (College)
The reason why : $b a careful collection of many hundreds of reasons for things which, though generally believed, are imperfectly understood. A book of condensed scientific knowledge for the million
Philp, Robert Kemp
1,725 Gutenberg downloadsen2014Difficulty 86 (Specialist)
Aristotle's History of Animals In Ten Books
Aristotle
1,722 Gutenberg downloadsen2019Difficulty 55 (Graduate)
How to Use the Popular Science Library; History of Science; General Index
Serviss, Garrett Putman & Selwyn-Brown, Arthur
1,718 Gutenberg downloadsen2016Difficulty 64 (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
1,671 Gutenberg downloadsen2022Difficulty 66 (Academic)
The Evolution of Man
Haeckel, Ernst
1,620 Gutenberg downloadsen2005Difficulty 49 (College)
The Common Spiders of the United States
Emerton, J. H. (James Henry)
1,586 Gutenberg downloadsen2013Difficulty 45 (College)
Encyclopaedia Britannica, 11th Edition, "Echinoderma" to "Edward, prince of Wales" Volume 8, Slice 10
Various
1,575 Gutenberg downloadsen2011Difficulty 65 (Academic)
Snakes: Curiosities and Wonders of Serpent Life
Hopley, Catherine Cooper
1,554 Gutenberg downloadsen2016Difficulty 56 (Graduate)
Applied Eugenics
Popenoe, Paul & Johnson, Roswell H. (Roswell Hill)
1,533 Gutenberg downloadsen2006Difficulty 55 (Graduate)
The Natural History of Pliny, Volume 5 (of 6)
Pliny, the Elder
1,518 Gutenberg downloadsen2019Difficulty 50 (College)
Cave Hunting Researches on the evidence of caves respecting the early inhabitants of Europe
Dawkins, William Boyd
1,484 Gutenberg downloadsen2016Difficulty 77 (Expert)
The Biotic Associations of Cockroaches
Roth, Louis M. (Louis Marcus) & Willis, Edwin R.
1,484 Gutenberg downloadsen2014Difficulty 71 (Expert)
Lamarck, the Founder of Evolution: His Life and Work
Packard, A. S. (Alpheus Spring)
1,464 Gutenberg downloadsen2007Difficulty 58 (Graduate)
Fabre's Book of Insects
Fabre, Jean-Henri
1,451 Gutenberg downloadsen2021Difficulty 43 (College)
Encyclopaedia Britannica, 11th Edition, "Ichthyology" to "Independence" Volume 14, Slice 3
Various
1,446 Gutenberg downloadsen2012Difficulty 67 (Academic)
The Autobiography of Charles Darwin
Darwin, Charles
1,446 Gutenberg downloadsen1999Difficulty 53 (Graduate)
Handbook of Birmingham Prepared for the Members of the British Association, 1886
British Association for the Advancement of Science
1,428 Gutenberg downloadsen2015Difficulty 51 (Graduate)
The Story-book of Science
Fabre, Jean-Henri
1,386 Gutenberg downloadsen2018Difficulty 43 (College)
Micrographia Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with Observations and Inquiries Thereupon
Hooke, Robert
1,379 Gutenberg downloadsen2005Difficulty 76 (Expert)
Life and Letters of Charles Darwin — Volume 2
Darwin, Charles
1,352 Gutenberg downloadsen2000Difficulty 53 (Graduate)
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.
1,315 Gutenberg downloadsen2016Difficulty 54 (Graduate)
The Animal Parasites of Man
Fantham, Harold Benjamin & Braun, Max & Stephens, J. W. W. (John William Watson) & Theobald, Fred. V. (Frederick Vincent)
1,312 Gutenberg downloadsen2018Difficulty 67 (Academic)
Wild Flowers An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors
Blanchan, Neltje
1,296 Gutenberg downloadsen2002Difficulty 58 (Graduate)
The Cambridge natural history, Vol. 06 (of 10)
Sharp, David
1,288 Gutenberg downloadsen2023Difficulty 65 (Academic)
The Prolongation of Life: Optimistic Studies
Metchnikoff, Elie
1,265 Gutenberg downloadsen2016Difficulty 58 (Graduate)
The Book of the Pearl The history, art, science, and industry of the queen of gems
Kunz, George Frederick & Stevenson, Charles Hugh
1,259 Gutenberg downloadsen2020Difficulty 64 (Academic)
The Power of Movement in Plants
Darwin, Charles & Darwin, Francis, Sir
1,241 Gutenberg downloadsen2004Difficulty 70 (Academic)
Darwin and Modern Science
Seward, A. C. (Albert Charles)
1,217 Gutenberg downloadsen1999Difficulty 56 (Graduate)
History of Botany (1530-1860)
Sachs, Julius
1,217 Gutenberg downloadsen2020Difficulty 72 (Expert)
Cosmos: A Sketch of the Physical Description of the Universe, Vol. 1
Humboldt, Alexander von
1,206 Gutenberg downloadsen2005Difficulty 67 (Academic)
Encyclopaedia Britannica, 11th Edition, "Foraminifera" to "Fox, Edward" Volume 10, Slice 6
Various
1,193 Gutenberg downloadsen2011Difficulty 67 (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
1,187 Gutenberg downloadsen2001Difficulty 63 (Academic)
A text-book of veterinary anatomy
Sisson, Septimus
1,184 Gutenberg downloadsen2025Difficulty 76 (Expert)
History of the Conflict Between Religion and Science
Draper, John William
1,183 Gutenberg downloadsen1998Difficulty 62 (Academic)
An essay towards a natural history of serpents
Owen, Charles
1,181 Gutenberg downloadsen2023Difficulty 49 (College)
The Descent of Man and Selection in Relation to Sex, Vol. I
Darwin, Charles
1,174 Gutenberg downloadsen2011Difficulty 65 (Academic)
Clever Hans (The Horse of Mr. Von Osten) A contribution to experimental animal and human psychology
Pfungst, Oskar
1,171 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Beginners' botany
Bailey, L. H. (Liberty Hyde)
1,144 Gutenberg downloadsen2024Difficulty 50 (College)
The Life of the Bee
Maeterlinck, Maurice
1,143 Gutenberg downloadsen2003Difficulty 60 (Graduate)
The Journal of a Disappointed Man
Barbellion, W. N. P.
1,112 Gutenberg downloadsen2012Difficulty 42 (College)
Encyclopaedia Britannica, 11th Edition, "Matter" to "Mecklenburg" Volume 17, Slice 8
Various
1,104 Gutenberg downloadsen2013Difficulty 71 (Expert)
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
1,104 Gutenberg downloadsen2003Difficulty 66 (Academic)
Origin of Cultivated Plants The International Scientific Series Volume XLVIII
Candolle, Alphonse de
1,080 Gutenberg downloadsen2014Difficulty 62 (Academic)
Mammals of Washington, Volume 2 University of Kansas Publications Museum of Natural History
Dalquest, Walter Woelber
1,076 Gutenberg downloadsen2016Difficulty 52 (Graduate)
Insectivorous Plants
Darwin, Charles
1,069 Gutenberg downloadsen2004Difficulty 63 (Academic)
The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
Thomson, J. Arthur (John Arthur)
1,062 Gutenberg downloadsen2007Difficulty 66 (Academic)
The Principles of Biology, Volume 1 (of 2)
Spencer, Herbert
1,057 Gutenberg downloadsen2017Difficulty 63 (Academic)
Sex-linked Inheritance in Drosophila
Morgan, Thomas Hunt & Bridges, Calvin B. (Calvin Blackman)
1,054 Gutenberg downloadsen2010Difficulty 60 (Graduate)
The Snakes of Europe
Boulenger, George Albert
1,042 Gutenberg downloadsen2014Difficulty 63 (Academic)
Australian insects
Froggatt, Walter W. (Walter Wilson)
1,037 Gutenberg downloadsen2025Difficulty 52 (Graduate)
Research methods in ecology
Clements, Frederic E. (Frederic Edward)
1,024 Gutenberg downloadsen2024Difficulty 50 (College)
Mutual Aid: A Factor of Evolution
Kropotkin, Petr Alekseevich, kniaz
1,020 Gutenberg downloadsen2003Difficulty 73 (Expert)
Whale hunting with gun and camera A naturalist's account of the modern shore-whaling industry, of whales and their habits, and of hunting experiences in various parts of the world
Andrews, Roy Chapman
1,017 Gutenberg downloadsen2022Difficulty 87 (Specialist)
The Cambridge natural history, Vol. 03 (of 10)
Cooke, A. H. (Alfred Hands) & Reed, F. R. C. (Frederick Richard Cowper)
1,015 Gutenberg downloadsen2023Difficulty 63 (Academic)
More Letters of Charles Darwin — Volume 2 A Record of His Work in a Series of Hitherto Unpublished Letters
Darwin, Charles
1,013 Gutenberg downloadsen2001Difficulty 50 (College)
Fungi: Their Nature and Uses
Cooke, M. C. (Mordecai Cubitt)
1,011 Gutenberg downloadsen2009Difficulty 57 (Graduate)
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
992 Gutenberg downloadsen2004Difficulty 61 (Academic)
The Naturalist on the River Amazons
Bates, Henry Walter
992 Gutenberg downloadsen2000Difficulty 67 (Academic)
Artistic Anatomy of Animals
Cuyer, Édouard
989 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Cassell's Natural History, Vol. 2 (of 6)
Unknown
989 Gutenberg downloadsen2019Difficulty 99 (Quantum Electrodynamics)
Tobacco; Its History, Varieties, Culture, Manufacture and Commerce
Billings, E. R.
987 Gutenberg downloadsen2008Difficulty 59 (Graduate)
Bramble-Bees and Others
Fabre, Jean-Henri
985 Gutenberg downloadsen2002Difficulty 52 (Graduate)
Sketches of the Natural History of Ceylon
Tennent, James Emerson, Sir
979 Gutenberg downloadsen2004Difficulty 72 (Expert)
Reptiles and Birds A Popular Account of Their Various Orders, With a Description of the Habits and Economy of the Most Interesting
Figuier, Louis
977 Gutenberg downloadsen2014Difficulty 79 (Expert)
The Cambridge natural history, Vol. 09 (of 10)
Evans, A. H. (Arthur Humble)
977 Gutenberg downloadsen2024Difficulty 59 (Graduate)
Himalayan Journals — Complete Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.
Hooker, Joseph Dalton
971 Gutenberg downloadsen2004Difficulty 99 (Quantum Electrodynamics)
Form and Function: A Contribution to the History of Animal Morphology
Russell, E. S. (Edward Stuart)
968 Gutenberg downloadsen2007Difficulty 59 (Graduate)
The Formation of Vegetable Mould Through the Action of Worms With Observations on Their Habits
Darwin, Charles
961 Gutenberg downloadsen2000Difficulty 63 (Academic)
Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1
Humboldt, Alexander von & Bonpland, Aimé
959 Gutenberg downloadsen2004Difficulty 55 (Graduate)
The Cambridge natural history, Vol. 08 (of 10)
Gadow, Hans
959 Gutenberg downloadsen2024Difficulty 63 (Academic)
Reflections on the Decline of Science in England, and on Some of Its Causes
Babbage, Charles
958 Gutenberg downloadsen1998Difficulty 63 (Academic)
Galen: On the Natural Faculties
Galen
957 Gutenberg downloadsen2013Difficulty 65 (Academic)
The Life of the Spider
Fabre, Jean-Henri
956 Gutenberg downloadsen1999Difficulty 52 (Graduate)
The grapes of New York
Hedrick, U. P.
951 Gutenberg downloadsen2014Difficulty 63 (Academic)
Evidence as to Man's Place in Nature
Huxley, Thomas Henry
948 Gutenberg downloadsen2001Difficulty 56 (Graduate)
Mental Evolution in Man: Origin of Human Faculty
Romanes, George John
947 Gutenberg downloadsen2015Difficulty 68 (Academic)
The Science of Fingerprints: Classification and Uses
United States. Federal Bureau of Investigation
947 Gutenberg downloadsen2006Difficulty 61 (Academic)
The Mason-Wasps
Fabre, Jean-Henri
946 Gutenberg downloadsen2021Difficulty 50 (College)
The Cambridge natural history, Vol. 01 (of 10)
Hartog, Marcus & Hickson, Sydney J. (Sydney John) & MacBride, E. W. (Ernest William) & Sollas, Igerna Brünhilda Johnson
944 Gutenberg downloadsen2023Difficulty 71 (Expert)
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
938 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Charles Darwin: His Life Told in an Autobiographical Chapter, and in a Selected Series of His Published Letters
Darwin, Charles
935 Gutenberg downloadsen2012Difficulty 53 (Graduate)
Butterflies Worth Knowing
Weed, Clarence Moores
929 Gutenberg downloadsen2011Difficulty 66 (Academic)
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
Campbell, Douglas Houghton
928 Gutenberg downloadsen2007Difficulty 57 (Graduate)
The Microscope. Its History, Construction, and Application 15th ed. Being a familiar introduction to the use of the instrument, and the study of microscopical science
Hogg, Jabez
923 Gutenberg downloadsen2020Difficulty 67 (Academic)
A Guide to the Study of Fishes, Volume 2 (of 2)
Jordan, David Starr
920 Gutenberg downloadsen2016Difficulty 83 (Specialist)
Studies in the History and Method of Science, vol. 1 (of 2)
Unknown
919 Gutenberg downloadsen2014Difficulty 57 (Graduate)
Fossil plants, Vol. 1 : $b [A text-book] for students of botany and geology
Seward, A. C. (Albert Charles)
917 Gutenberg downloadsen2022Difficulty 57 (Graduate)
Thomas Henry Huxley; A Sketch Of His Life And Work
Mitchell, P. Chalmers (Peter Chalmers), Sir
916 Gutenberg downloadsen2005Difficulty 68 (Academic)
Manual of the Trees of North America (Exclusive of Mexico) 2nd ed.
Sargent, Charles Sprague
914 Gutenberg downloadsen2014Difficulty 78 (Expert)
The Cambridge natural history, Vol. 10 (of 10)
Beddard, Frank E. (Frank Evers)
913 Gutenberg downloadsen2012Difficulty 61 (Academic)
Woman in Science With an Introductory Chapter on Woman's Long Struggle for Things of the Mind
Zahm, J. A. (John Augustine)
908 Gutenberg downloadsen2011Difficulty 66 (Academic)
The Variation of Animals and Plants under Domestication
Darwin, Charles
907 Gutenberg downloadsen2002Difficulty 86 (Specialist)
Life histories of North American woodpeckers
Bent, Arthur Cleveland
904 Gutenberg downloadsen2024Difficulty 65 (Academic)
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
903 Gutenberg downloadsen2019Difficulty 68 (Academic)
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)
902 Gutenberg downloadsen2009Difficulty 47 (College)
Insect Architecture
Rennie, James
899 Gutenberg downloadsen2014Difficulty 50 (College)
The Life of Crustacea
Calman, W. T. (William Thomas)
899 Gutenberg downloadsen2012Difficulty 51 (Graduate)
The human species
Quatrefages, A. de (Armand de)
897 Gutenberg downloadsen2023Difficulty 56 (Graduate)
Nature's Teachings: Human Invention Anticipated by Nature
Wood, J. G. (John George)
896 Gutenberg downloadsen2016Difficulty 51 (Graduate)
The Evolution Theory, Vol. 1 of 2
Weismann, August
893 Gutenberg downloadsen2021Difficulty 59 (Graduate)
A History of North American Birds; Land Birds; Vol. 3 of 3
Baird, Spencer Fullerton & Brewer, T. M. (Thomas Mayo) & Ridgway, Robert
889 Gutenberg downloadsen2017Difficulty 59 (Graduate)
Handbook of Medical Entomology
Riley, William A. (William Albert) & Johannsen, O. A. (Oskar Augustus)
883 Gutenberg downloadsen2010Difficulty 57 (Graduate)
The Life of the Grasshopper
Fabre, Jean-Henri
883 Gutenberg downloadsen2021Difficulty 51 (Graduate)
Cassell's book of birds; vol. 3
Brehm, Alfred Edmund
881 Gutenberg downloadsen2019Difficulty 62 (Academic)
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
879 Gutenberg downloadsen2017Difficulty 62 (Academic)
Le monde de la mer
Moquin-Tandon, Alfred
876 Gutenberg downloadsfr2023
The Moths of the British Isles, First Series Comprising the Families Sphingidæ to Noctuidæ
South, Richard
876 Gutenberg downloadsen2013Difficulty 54 (Graduate)
Cassell's Natural History, Vol. 1 (of 6)
Unknown
875 Gutenberg downloadsen2017Difficulty 94 (Quantum Electrodynamics)
Louis Agassiz: His Life and Correspondence
Agassiz, Louis
873 Gutenberg downloadsen2004Difficulty 49 (College)
American Pomology. Apples
Warder, J. A. (John Aston)
868 Gutenberg downloadsen2011Difficulty 64 (Academic)
The Life of the Fly; With Which are Interspersed Some Chapters of Autobiography
Fabre, Jean-Henri
868 Gutenberg downloadsen2002Difficulty 54 (Graduate)
Inquiries into human faculty and its development
Galton, Francis
865 Gutenberg downloadsen2004Difficulty 79 (Expert)
Food Poisoning
Jordan, Edwin O. (Edwin Oakes)
864 Gutenberg downloadsen2010Difficulty 65 (Academic)
Botany: The Science of Plant Life
Taylor, Norman
862 Gutenberg downloadsen2015Difficulty 56 (Graduate)
The Butterfly Book A Popular Guide to a Knowledge of the Butterflies of North America
Holland, W. J. (William Jacob)
862 Gutenberg downloadsen2012Difficulty 55 (Graduate)
The Nature of Animal Light
Harvey, E. Newton (Edmund Newton)
862 Gutenberg downloadsen2010Difficulty 71 (Expert)
Zoonomia; Or, the Laws of Organic Life, Vol. I
Darwin, Erasmus
862 Gutenberg downloadsen2005Difficulty 64 (Academic)
Encyclopaedia Britannica, 11th Edition, "Joints" to "Justinian I." Volume 15, Slice 5
Various
860 Gutenberg downloadsen2012Difficulty 65 (Academic)
Bacteria Especially as they are related to the economy of nature, to industrial processes, and to the public health
Newman, George, Sir
855 Gutenberg downloadsen2015Difficulty 66 (Academic)
Parasites: A Treatise on the Entozoa of Man and Animals Including Some Account of the Ectozoa
Cobbold, T. Spencer (Thomas Spencer)
854 Gutenberg downloadsen2014Difficulty 60 (Graduate)
A Text-Book of Horseshoeing, for Horseshoers and Veterinarians
Lungwitz, A. (Anton)
853 Gutenberg downloadsen2021Difficulty 55 (Graduate)
A Monograph on the Sub-class Cirripedia (Volume 1 of 2) The Lepadidae; Or, Pedunculated Cirripedes
Darwin, Charles
852 Gutenberg downloadsen2010Difficulty 59 (Graduate)
A History of North American Birds; Land Birds; Vol. 2 of 3
Baird, Spencer Fullerton & Brewer, T. M. (Thomas Mayo) & Ridgway, Robert
845 Gutenberg downloadsen2017Difficulty 46 (College)
Histoire des légumes
Gibault, Georges
844 Gutenberg downloadsfr2021
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
840 Gutenberg downloadsen2012Difficulty 56 (Graduate)
Unconscious Memory
Butler, Samuel
840 Gutenberg downloadsen2004Difficulty 64 (Academic)
Zoölogy: The Science of Animal Life Popular Science Library, Volume XII (of 16), P. F. Collier & Son Company, 1922
Ingersoll, Ernest
839 Gutenberg downloadsen2015Difficulty 63 (Academic)
Nature readers : $b Sea-side and way-side. No. 4
Wright, Julia McNair
836 Gutenberg downloadsen2023Difficulty 45 (College)
A History of Science — Volume 4
Williams, Henry Smith & Williams, Edward Huntington
834 Gutenberg downloadsen1999Difficulty 68 (Academic)
The Cambridge natural history, Vol. 07 (of 10)
Boulenger, George Albert & Bridge, T. W. (Thomas William) & Herdman, W. A. (William Abbott), Sir
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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
830 Gutenberg downloadsen2010Difficulty 72 (Expert)
Man, Past and Present
Keane, A. H. (Augustus Henry)
830 Gutenberg downloadsen2011Difficulty 60 (Graduate)
The Progress of the Century
Unknown
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Extinct Monsters A Popular Account of Some of the Larger Forms of Ancient Animal Life
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The flowering plants of Africa An analytical key to the genera of African phanerograms
Thonner, Franz
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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
823 Gutenberg downloadsen2012Difficulty 64 (Academic)
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Vestiges of the Natural History of Creation
Chambers, Robert
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Life History and Ecology of the Five-Lined Skink, Eumeces fasciatus
Fitch, Henry S. (Henry Sheldon)
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Structure and Functions of the Body A Hand-Book of Anatomy and Physiology for Nurses and Others Desiring a Practical Knowledge of the Subject
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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
813 Gutenberg downloadsen2023Difficulty 74 (Expert)
Syndrome
Hoover, Thomas
812 Gutenberg downloadsen2010Difficulty 42 (College)
Life histories of North American shore birds, Part 1 (of 2)
Bent, Arthur Cleveland
810 Gutenberg downloadsen2014Difficulty 62 (Academic)
Science & Education: Essays
Huxley, Thomas Henry
802 Gutenberg downloadsen2004Difficulty 72 (Expert)
The Cambridge natural history, Vol. 05 (of 10)
Sedgwick, Adam & Sharp, David & Sinclair, F. G. (Frederick Granville)
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The Dog
Youatt, William
802 Gutenberg downloadsen2005Difficulty 60 (Graduate)
A History of Science — Volume 2
Williams, Henry Smith & Williams, Edward Huntington
799 Gutenberg downloadsen1999Difficulty 63 (Academic)
Autobiography and Selected Essays
Huxley, Thomas Henry
798 Gutenberg downloadsen2006Difficulty 54 (Graduate)
Cassell's book of birds; vol. 4
Brehm, Alfred Edmund
798 Gutenberg downloadsen2022Difficulty 58 (Graduate)
Bass, Pike, Perch, and Others
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793 Gutenberg downloadsen2012Difficulty 57 (Graduate)
Parallel Paths: A Study in Biology, Ethics, and Art
Rolleston, T. W. (Thomas William)
792 Gutenberg downloadsen2014Difficulty 69 (Academic)
The Arctic World : $b Its plants, animals, and natural phenomena. With a historical sketch of Arctic discovery, down to the British polar expedition: 1875-76.
Anonymous
792 Gutenberg downloadsen2023Difficulty 60 (Graduate)
The Chemistry of Plant Life
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791 Gutenberg downloadsen2010Difficulty 88 (Specialist)
Life and death
Dastre, A. (Albert)
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Hedrick, U. P.
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The Physical Basis of Mind Being the Second Series of Problems of Life and Mind.
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Venoms: Venomous Animals and Antivenomous Serum-therapeutics
Calmette, A. (Albert)
786 Gutenberg downloadsen2016Difficulty 56 (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
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785 Gutenberg downloadsen2013Difficulty 64 (Academic)
The Sea-beach at Ebb-tide A Guide to the Study of the Seaweeds and the Lower Animal Life Found Between Tide-marks
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South, Richard
782 Gutenberg downloadsen2013Difficulty 57 (Graduate)
Life Movements in Plants, Volume II
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781 Gutenberg downloadsen2012Difficulty 73 (Expert)
The Works of William Harvey M.D. Translated from the Latin with a life of the author
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780 Gutenberg downloadsen2019Difficulty 66 (Academic)
The book of antelopes, vol. 1 (of 4)
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779 Gutenberg downloadsen2023Difficulty 49 (College)
Insect life: Souvenirs of a naturalist
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777 Gutenberg downloadsen2022Difficulty 51 (Graduate)
The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science
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777 Gutenberg downloadsen2004Difficulty 76 (Expert)
Falling in Love; With Other Essays on More Exact Branches of Science
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775 Gutenberg downloadsen2005Difficulty 64 (Academic)
The Riddle of the Universe at the close of the nineteenth century
Haeckel, Ernst
774 Gutenberg downloadsen2013Difficulty 72 (Expert)
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772 Gutenberg downloadsen2023Difficulty 65 (Academic)
Philosophical Transactions of the Royal Society - Vol 1 - 1666 Giving some Accompt of the present Undertakings, Studies, and Labours of the Ingenious in many considerable parts of the World
Various
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The Mason-Bees
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Anatomy of the Cat
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761 Gutenberg downloadsen2018Difficulty 52 (Graduate)
Response in the Living and Non-Living
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Warum wir sterben
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Bodily changes in pain, hunger, fear, and rage : $b an account of recent researches into the function of emotional excitement
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The Vertebrate Skeleton
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759 Gutenberg downloadsen2013Difficulty 64 (Academic)
A History of Science — Volume 1
Williams, Henry Smith & Williams, Edward Huntington
758 Gutenberg downloadsen1999Difficulty 65 (Academic)
The Story of Evolution
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758 Gutenberg downloadsen1997Difficulty 56 (Graduate)
Biographies of distinguished scientific men. First series
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757 Gutenberg downloadsen2005Difficulty 52 (Graduate)
The romance of insect life : $b Interesting descriptions of the strange and curious in the insect world
Selous, Edmund
755 Gutenberg downloadsen2023Difficulty 76 (Expert)
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753 Gutenberg downloadsen2008Difficulty 44 (College)
The Effects of Cross & Self-Fertilisation in the Vegetable Kingdom
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Text book of veterinary medicine, Volume 3 (of 5)
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A system of practical medicine. By American authors. Vol. 1 : $b Pathology and general diseases
Unknown
747 Gutenberg downloadsen2012Difficulty 63 (Academic)
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Social Life in the Insect World
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General Anatomy, Applied to Physiology and Medicine, Vol. 2 (of 3)
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The Cambridge natural history, Vol. 04 (of 10)
Smith, Geoffrey & Thompson, D'Arcy Wentworth & Warburton, Cecil & Weldon, Walter Frank Raphael & Woods, Henry
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The heart of Africa, Vol. 1 (of 2)
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The Botanical Magazine, Vol. 07 Or, Flower-Garden Displayed
Curtis, William
741 Gutenberg downloadsen2007Difficulty 58 (Graduate)
A History of North American Birds; Land Birds; Vol. 1 of 3
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British Bees An Introduction into the Studies of the Natural History and Economy of the Bees Indigenous to the British Isles
Shuckard, William Edward
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The Farmer's Veterinarian: A Practical Treatise on the Diseases of Farm Stock
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Animal Life and Intelligence
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Glimpses of Ocean Life; Or, Rock-Pools and the Lessons they Teach
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Alfred Russel Wallace: Letters and Reminiscences, Vol. 1
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Species and Varieties, Their Origin by Mutation
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Darwinism (1889) An exposition of the theory of natural selection, with some of its applications
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Elements of Physiophilosophy
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Life and Letters of Thomas Henry Huxley — Volume 3
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Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)
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Eleanor Ormerod, LL. D., Economic Entomologist : Autobiography and Correspondence
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General Anatomy, Applied to Physiology and Medicine, Vol. 1 (of 3)
Bichat, Xavier
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The Minds and Manners of Wild Animals: A Book of Personal Observations
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Woman and Womanhood: A Search for Principles
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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
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Forest Trees of Texas: How to Know Them
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Observations of a Naturalist in the Pacific Between 1896 and 1899, Volume 2 Plant-Dispersal
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The Wonders of Instinct: Chapters in the Psychology of Insects
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Extinct birds : $b An attempt to unite in one volume a short account of those birds which have become extinct in historical times
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Het Leven der Dieren. Derde Deel, Hoofdstuk 1 tot 4, De Kruipende Dieren
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Various
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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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The useful trees of northern Nigeria
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The Elements of Botany, For Beginners and For Schools
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The Glands Regulating Personality A Study of the Glands of Internal Secretion in Relation to the Types of Human Nature
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Handbook of the Trees of New England
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The Evolution of Marriage and of the Family
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Scurvy, Past and Present
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706 Gutenberg downloadsen2009Difficulty 53 (Graduate)
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Monism as Connecting Religion and Science A Man of Science
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An Introduction to the History of Science
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702 Gutenberg downloadsen2021Difficulty 49 (College)
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The Different Forms of Flowers on Plants of the Same Species
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698 Gutenberg downloadsen2003Difficulty 62 (Academic)
The botanist's repository for new and rare plants; vol. 01 & 02 [of 10]
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The Harvest of the Sea A contribution to the natural and economic history of the British food fishes
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693 Gutenberg downloadsen2010Difficulty 63 (Academic)
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Book of monsters : $b Portraits and biographies of a few of the inhabitants of woodland and meadow
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685 Gutenberg downloadsen2009Difficulty 50 (College)
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The Life-Story of Insects
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684 Gutenberg downloadsen2005Difficulty 57 (Graduate)
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682 Gutenberg downloadsen2008Difficulty 67 (Academic)
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679 Gutenberg downloadsen2019Difficulty 88 (Specialist)
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On the Relations of Man to the Lower Animals
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676 Gutenberg downloadsen2001Difficulty 72 (Expert)
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671 Gutenberg downloadsen2010Difficulty 53 (Graduate)
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665 Gutenberg downloadsen1996Difficulty 57 (Graduate)
Lives of Eminent Zoologists, from Aristotle to Linnæus with Introductory remarks on the Study of Natural History
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664 Gutenberg downloadsen2010Difficulty 84 (Specialist)
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Olin, George
660 Gutenberg downloadsen2016Difficulty 57 (Graduate)
The book of antelopes, vol. 4 (of 4)
Sclater, Philip Lutley & Thomas, Oldfield
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Man's Place in Nature, and Other Essays
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659 Gutenberg downloadsen2012Difficulty 65 (Academic)
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658 Gutenberg downloadsen2018Difficulty 58 (Graduate)
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Unknown
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Life and Letters of Thomas Henry Huxley — Volume 1
Huxley, Thomas Henry
655 Gutenberg downloadsen2004Difficulty 58 (Graduate)
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Various
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654 Gutenberg downloadsen2021Difficulty 63 (Academic)
The Variation of Animals and Plants under Domestication — Volume 2
Darwin, Charles
654 Gutenberg downloadsen2001Difficulty 72 (Expert)
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Fossil plants, Vol. 3 : $b A text-book for students of botany and geology
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648 Gutenberg downloadsen2025Difficulty 64 (Academic)
New Zealand Moths and Butterflies (Macro-Lepidoptera)
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648 Gutenberg downloadsen2013Difficulty 60 (Graduate)
The ivory king : $b A popular history of the elephant and its allies
Holder, Charles Frederick
647 Gutenberg downloadsen2021Difficulty 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)
647 Gutenberg downloadsen2014Difficulty 71 (Expert)
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Sclater, Philip Lutley & Hudson, W. H. (William Henry)
646 Gutenberg downloadsen2012Difficulty 56 (Graduate)
The Coming of Evolution: The Story of a Great Revolution in Science
Judd, John W. (John Wesley)
646 Gutenberg downloadsen2010Difficulty 68 (Academic)
A Natural History for Young People: Our Animal Friends in Their Native Homes including mammals, birds and fishes
Humphreys, Phebe Westcott
645 Gutenberg downloadsen2015Difficulty 63 (Academic)
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Hedrick, U. P.
645 Gutenberg downloadsen2014Difficulty 67 (Academic)
A Historical Account of Useful Inventions and Scientific Discoveries Being a manual of instruction and entertainment.
Grant, George
644 Gutenberg downloadsen2016Difficulty 62 (Academic)
The Natural History of Cage Birds Their Management, Habits, Food, Diseases, Treatment, Breeding, and the Methods of Catching Them.
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Physiological Researches on Life and Death
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638 Gutenberg downloadsen2018Difficulty 60 (Graduate)
William Harvey and the Discovery of the Circulation of the Blood
Huxley, Thomas Henry
638 Gutenberg downloadsen2001Difficulty 62 (Academic)
A History of Science — Volume 5
Williams, Henry Smith & Williams, Edward Huntington
637 Gutenberg downloadsen2009Difficulty 57 (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
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Drawings and Pharmacy in Al-Zahrawi's 10th-Century Surgical Treatise
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Every Girl's Book
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Poisonous Snakes of Texas and First Aid Treatment of Their Bites Bulletin No. 31
Werler, John E.
634 Gutenberg downloadsen2017Difficulty 58 (Graduate)
Animal Life in Field and Garden
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633 Gutenberg downloadsen2021Difficulty 47 (College)
Aspects of nature, in different lands and different climates (Vol. 2 of 2) with scientific elucidations
Humboldt, Alexander von
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Cassell's Natural History, Vol. 3 (of 6)
Unknown
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Cavity-Nesting Birds of North American Forests Agriculture Handbook 511
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Souvenirs entomologiques - Livre I Étude sur l'instinct et les moeurs des insectes
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Studies of trees in winter : $b A description of the deciduous trees of northeastern America
Huntington, Annie Oakes
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Duellman, William Edward
628 Gutenberg downloadsen2010Difficulty 63 (Academic)
A handbook of systematic botany
Warming, Eugenius
627 Gutenberg downloadsen2022Difficulty 55 (Graduate)
The Origin of Vertebrates
Gaskell, Walter Holbrook
627 Gutenberg downloadsen2013Difficulty 82 (Specialist)
The Sacred Beetle, and Others
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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
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626 Gutenberg downloadsen2014Difficulty 58 (Graduate)
The Meaning of Evolution
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Wild Animals of North America Intimate Studies of Big and Little Creatures of the Mammal Kingdom
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Animal Intelligence The International Scientific Series, Vol. XLIV.
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The winners in life's race : $b Or, the great backboned family
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An Introduction to Nature-study
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Darwinism stated by Darwin himself Characteristic passages from the writings of Charles Darwin
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Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, II. Band Von Galilei bis zur Mitte des XVIII. Jahrhunderts
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The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee
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Collected Essays, Volume V Science and Christian Tradition: Essays
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620 Gutenberg downloadsen2005Difficulty 64 (Academic)
Animals of the Past
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Life of Charles Darwin
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Tennent, James Emerson, Sir
613 Gutenberg downloadsen2018Difficulty 65 (Academic)
Scientific American Supplement, No. 598, June 18, 1887
Various
612 Gutenberg downloadsen2004Difficulty 50 (College)
Physics and Politics, or, Thoughts on the application of the principles of "natural selection" and "inheritance" to political society
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611 Gutenberg downloadsen2003Difficulty 64 (Academic)
Student's Hand-book of Mushrooms of America, Edible and Poisonous
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608 Gutenberg downloadsen2005Difficulty 57 (Graduate)
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605 Gutenberg downloadsen2012Difficulty 62 (Academic)
Nests and Eggs of Birds of the United States Illustrated
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The Chautauquan, Vol. 04, October 1883
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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
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A Report upon the Mollusk Fisheries of Massachusetts
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Carpet Beetles and Their Control
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Darwiniana : Essays — Volume 02
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The Origin of Man and of His Superstitions
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Luck, or Cunning, as the Main Means of Organic Modification
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More Beetles
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600 Gutenberg downloadsen2022Difficulty 47 (College)
Scientific American, Volume XXXVI., No. 8, February 24, 1877 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures.
Various
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The Life and Love of the Insect
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The Evolution Theory, Vol. 2 of 2
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Memoirs of the Distinguished Men of Science of Great Britain Living in the Years 1807-8
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The Ocean World: Being a Description of the Sea and Its Living Inhabitants.
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595 Gutenberg downloadsen2013Difficulty 67 (Academic)
Darwiniana; Essays and Reviews Pertaining to Darwinism
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594 Gutenberg downloadsen2004Difficulty 69 (Academic)
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594 Gutenberg downloadsen2012Difficulty 70 (Academic)
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592 Gutenberg downloadsen2015Difficulty 50 (College)
Fossil plants, Vol. 2 : $b A text-book for students of botany and geology
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591 Gutenberg downloadsen2022Difficulty 63 (Academic)
Journal of a tour in Marocco and the Great Atlas
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Cassell's book of birds; vol. 1
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589 Gutenberg downloadsen2015Difficulty 61 (Academic)
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Creierul, O Enigma Descifrata
Moisa, Dorin Teodor
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Catalogue of Economic Plants in the Collection of the U. S. Department of Agriculture
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Life: Its True Genesis
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580 Gutenberg downloadsen2005Difficulty 60 (Graduate)
Pioneers of Evolution from Thales to Huxley With an Intermediate Chapter on the Causes of Arrest of the Movement
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Inorganic Plant Poisons and Stimulants
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General Anatomy, Applied to Physiology and Medicine, Vol. 3 (of 3)
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Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz
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The Origin of Species From 'The Westminster Review', April 1860
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Text Book of Biology, Part 1: Vertebrata
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576 Gutenberg downloadsen2007Difficulty 61 (Academic)
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
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Scientific American Supplement, No. 711, August 17, 1889
Various
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Essays Upon Heredity and Kindred Biological Problems Authorised Translation
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Charles Darwin and the Theory of Natural Selection
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Time and Change
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British Pomology Or, the History, Description, Classification, and Synonymes, of the Fruits and Fruit Trees of Great Britain
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The Natural History of the Varieties of Man
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An Introduction to Entomology: Vol. 2 or Elements of the Natural History of the Insects
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562 Gutenberg downloadsen2013Difficulty 61 (Academic)
Metapsychical Phenomena: Methods and Observations
Maxwell, J. (Joseph)
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The Nests and Eggs of Indian Birds, Volume 1
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Alfred Russel Wallace: Letters and Reminiscences, Vol. 2
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A Review of the Systems of Ethics Founded on the Theory of Evolution
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A Hand-book to the Primates, Volume 1 (of 2)
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Journal of the Proceedings of the Linnean Society - Vol. 4 Zoology
Linnean Society of London
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The Biology, Physiology and Sociology of Reproduction Also Sexual Hygiene with Special Reference to the Male
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Various & Royal Society (Great Britain)
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Our Domestic Birds: Elementary Lessons in Aviculture
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Plants Poisonous to Live Stock
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The Whence and the Whither of Man A Brief History of His Origin and Development through Conformity to Environment; Being the Morse Lectures of 1895
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A Mechanical Account of Poisons in Several Essays
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The botanist's repository for new and rare plants; vol. 03 & 04 [of 10]
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The Principles of Biology, Volume 2 (of 2)
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Essays Upon Some Controverted Questions
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Facts and Arguments for Darwin
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The Honey-Bee: Its Natural History, Physiology and Management
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550 Gutenberg downloadsen2018Difficulty 44 (College)
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
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Lachesis Lapponica; Or, A Tour in Lapland, Volume 1
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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.
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The Principal Species of Wood: Their Characteristic Properties First Edition
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An Introduction to Entomology: Vol. 1 or Elements of the Natural History of the Insects
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Poisonous Dwellers of the Desert
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The Book of Love
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The Botanical Magazine, Vol. 01 Or, Flower-Garden Displayed
Curtis, William
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The Structure and Life-history of the Cockroach (Periplaneta orientalis) An Introduction to the Study of Insects
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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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Scientific American magazine Vol 2. No. 3 Oct 10 1846 The Advocate of Industry and Journal of Scientific, Mechanical and Other Improvements
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Law, James
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Lameness of the Horse Veterinary Practitioners' Series, No. 1
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On the Genesis of Species
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Scientific American Supplement, No. 561, October 2, 1886
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The Dolphin in History
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Biology and Its Makers With Portraits and Other Illustrations
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Botany for Ladies or, A Popular Introduction to the Natural System of Plants, According to the Classification of De Candolle.
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Trees of Indiana First Revised Edition (Publication No. 13, Department of Conservation, State of Indiana)
Deam, Charles Clemon
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On Some Fossil Remains of Man
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Dragons of the Air: An Account of Extinct Flying Reptiles
Seeley, H. G. (Harry Govier)
535 Gutenberg downloadsen2011Difficulty 54 (Graduate)
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Scientific American Supplement, No. 299, September 24, 1881
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Appletons' Popular Science Monthly, December 1899 Vol. LVI, November, 1899 to April, 1900
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North American Recent Soft-Shelled Turtles (Family Trionychidae)
Webb, Robert G. (Robert Gravem)
532 Gutenberg downloadsen2012Difficulty 71 (Expert)
Appletons' Popular Science Monthly, April 1899 Volume LIV, No. 6, April 1899
Various
531 Gutenberg downloadsen2013Difficulty 56 (Graduate)
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)
531 Gutenberg downloadsen2022Difficulty 49 (College)
Through Magic Glasses and Other Lectures A Sequel to The Fairyland of Science
Buckley, Arabella B. (Arabella Burton)
531 Gutenberg downloadsen2011Difficulty 58 (Graduate)
Proceedings of the California Academy of Sciences, Volume III, 1863-1867
Various
530 Gutenberg downloadsen2020Difficulty 58 (Graduate)
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
529 Gutenberg downloadsen2018Difficulty 58 (Graduate)
Buffon's Natural History. Volume 07 (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
529 Gutenberg downloadsen2014Difficulty 60 (Graduate)
The Fantastic Clan: The Cactus Family
Thornber, J. J. (John James) & Bonker, Frances
528 Gutenberg downloadsen2014Difficulty 67 (Academic)
Flowers of the Southwest Deserts
Dodge, Natt N. (Natt Noyes)
527 Gutenberg downloadsen2016Difficulty 61 (Academic)
Scientific American Supplement, No. 795, March 28, 1891
Various
527 Gutenberg downloadsen2004Difficulty 62 (Academic)
The Illustrated Self-Instructor in Phrenology and Physiology
Fowler, O. S. (Orson Squire) & Fowler, L. N. (Lorenzo Niles)
527 Gutenberg downloadsen2010Difficulty 64 (Academic)
Guide to the study of animal ecology
Adams, Charles C. (Charles Christopher)
526 Gutenberg downloadsen2023Difficulty 66 (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
526 Gutenberg downloadsen2001Difficulty 64 (Academic)
The Science and Philosophy of the Organism
Driesch, Hans
526 Gutenberg downloadsen2013Difficulty 67 (Academic)
A Synopsis of the Birds of North America
Audubon, John James
525 Gutenberg downloadsen2013Difficulty 50 (College)
Trees: A Woodland Notebook Containing Observations on Certain British and Exotic Trees
Maxwell, Herbert, Sir
525 Gutenberg downloadsen2012Difficulty 59 (Graduate)
Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses
Packard, A. S. (Alpheus Spring)
524 Gutenberg downloadsen2008Difficulty 53 (Graduate)
Apes and Monkeys: Their Life and Language
Garner, R. L. (Richard Lynch)
523 Gutenberg downloadsen2022Difficulty 55 (Graduate)
Homo-Culture; Or, The Improvement of Offspring Through Wiser Generation
Holbrook, M. L. (Martin Luther)
523 Gutenberg downloadsen2010Difficulty 66 (Academic)
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
523 Gutenberg downloadsen2004Difficulty 42 (College)
The Naturalist's Repository, Volume 1 (of 5) or Monthly Miscellany of Exotic Natural History: etc. etc.
Donovan, E. (Edward)
523 Gutenberg downloadsen2017Difficulty 76 (Expert)
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
522 Gutenberg downloadsen2022Difficulty 63 (Academic)
The romance of the animal world : $b Interesting descriptions of the strange & curious in natural history
Selous, Edmund
522 Gutenberg downloadsen2023Difficulty 63 (Academic)
Wood and Forest
Noyes, William
522 Gutenberg downloadsen2011Difficulty 51 (Graduate)
Animal portraiture
Lydekker, Richard
521 Gutenberg downloadsen2023Difficulty 58 (Graduate)
Scientific American Supplement, No. 643, April 28, 1888
Various
521 Gutenberg downloadsen2005Difficulty 65 (Academic)
Life of Elie Metchnikoff, 1845-1916
Metchnikoff, Olga
520 Gutenberg downloadsen2013Difficulty 66 (Academic)
Mental Radio
Sinclair, Upton
520 Gutenberg downloadsen2020Difficulty 52 (Graduate)
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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Spiders
Warburton, Cecil
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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
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The Pros and Cons of Vivisection
Richet, Charles
520 Gutenberg downloadsen2011Difficulty 63 (Academic)
An Australian Bird Book: A Pocket Book for Field Use
Leach, John Albert
519 Gutenberg downloadsen2010Difficulty 51 (Graduate)
Common objects of the microscope
Wood, J. G. (John George)
519 Gutenberg downloadsen2017Difficulty 69 (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)
519 Gutenberg downloadsen2004Difficulty 62 (Academic)
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
519 Gutenberg downloadsen2021Difficulty 66 (Academic)
Personality of plants
Dixon, Royal & Fitch, Franklyn Everett
519 Gutenberg downloadsen2022Difficulty 54 (Graduate)
The English moths and butterflies : $b Together with the plants, flowers, and fruits whereon they feed, and are usually found.
Wilkes, Benjamin
519 Gutenberg downloadsen2024Difficulty 58 (Graduate)
The Botanist's Companion, Volume II Or an Introduction to the Knowledge of Practical Botany, and the Uses of Plants. Either Growing Wild in Great Britain, or Cultivated for the Puroses of Agriculture, Medicine, Rural Oeconomy, or the Arts
Salisbury, William
518 Gutenberg downloadsen2004Difficulty 55 (Graduate)
Essays on the Microscope Containing a Practical Description of the Most Improved Microscopes, a General History of Insects, etc., etc.
Adams, George
517 Gutenberg downloadsen2020Difficulty 62 (Academic)
Scientific American Supplement, No. 799, April 25, 1891
Various
517 Gutenberg downloadsen2004Difficulty 50 (College)
Some Common Birds Useful to the Farmer (1915 edition)
Beal, F. E. L. (Foster Ellenborough Lascelles)
516 Gutenberg downloadsen2020Difficulty 54 (Graduate)
The History of Insects
Unknown
516 Gutenberg downloadsen2004Difficulty 55 (Graduate)
The Migration of Birds
Coward, T. A. (Thomas Alfred)
516 Gutenberg downloadsen2013Difficulty 67 (Academic)
The Naturalist in Nicaragua
Belt, Thomas
516 Gutenberg downloadsen2004Difficulty 63 (Academic)
The Tropical World Aspects of man and nature in the equatorial regions of the globe.
Hartwig, G. (Georg)
516 Gutenberg downloadsen2020Difficulty 95 (Quantum Electrodynamics)
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
515 Gutenberg downloadsen2018Difficulty 64 (Academic)
The Fishing Industry
Gibbs, William E. (William Edward)
514 Gutenberg downloadsen2016Difficulty 54 (Graduate)
Zoological Illustrations, Volume 1 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
514 Gutenberg downloadsen2012Difficulty 64 (Academic)
Scientific American Supplement, No. 286, June 25, 1881
Various
513 Gutenberg downloadsen2005Difficulty 53 (Graduate)
The Evolution of Man — Volume 1
Haeckel, Ernst
513 Gutenberg downloadsen2004Difficulty 52 (Graduate)
A history of land mammals in the western hemisphere
Scott, William Berryman
512 Gutenberg downloadsen2025Difficulty 66 (Academic)
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
512 Gutenberg downloadsen2025Difficulty 57 (Graduate)
The book of antelopes, vol. 2 (of 4)
Sclater, Philip Lutley & Thomas, Oldfield
512 Gutenberg downloadsen2023Difficulty 48 (College)
Wasps, Social and Solitary
Peckham, George W. (George Williams) & Peckham, E. G. (Elizabeth Gifford)
512 Gutenberg downloadsen2014Difficulty 60 (Graduate)
The British Woodlice Being a Monograph of the Terrestrial Isopod Crustacea Occurring in the British Islands
Webb, Wilfred Mark & Sillem, Charles
511 Gutenberg downloadsen2013Difficulty 58 (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
510 Gutenberg downloadsen2016Difficulty 77 (Expert)
Dactylography; Or, The Study of Finger-prints
Faulds, Henry
509 Gutenberg downloadsen2015Difficulty 59 (Graduate)
Elementary Botany
Atkinson, George Francis
509 Gutenberg downloadsen2021Difficulty 53 (Graduate)
Speciation and Evolution of the Pygmy Mice, Genus Baiomys
Packard, Robert L. (Robert Lewis)
509 Gutenberg downloadsen2011Difficulty 64 (Academic)
Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901
Calkins, Gary N. (Gary Nathan)
508 Gutenberg downloadsen2006Difficulty 56 (Graduate)
The Taleef Shereef; Or, Indian Materia Medica
Unknown
508 Gutenberg downloadsen2016Difficulty 54 (Graduate)
Daedalus : $b or, Science and the future
Haldane, J. B. S. (John Burdon Sanderson)
507 Gutenberg downloadsen2023Difficulty 58 (Graduate)
Initiative in Evolution
Kidd, Walter
507 Gutenberg downloadsen2016Difficulty 57 (Graduate)
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
507 Gutenberg downloadsen2012Difficulty 71 (Expert)
Speciation in the Brazilian Spiny Rats
Moojen, João
507 Gutenberg downloadsen2013Difficulty 70 (Academic)
Useful Knowledge: Volume 2. Vegetables Or, a familiar account of the various productions of nature
Bingley, William
507 Gutenberg downloadsen2018Difficulty 51 (Graduate)
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
506 Gutenberg downloadsen2022Difficulty 59 (Graduate)
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
505 Gutenberg downloadsen2004Difficulty 65 (Academic)
Introduction à l'étude de la médecine expérimentale
Bernard, Claude
505 Gutenberg downloadsfr2005
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
505 Gutenberg downloadsen2001Difficulty 64 (Academic)
The Chautauquan, Vol. 05, June 1885, No. 9
Chautauqua Literary and Scientific Circle & Chautauqua Institution
504 Gutenberg downloadsen2017Difficulty 53 (Graduate)
An Introduction to Entomology: Vol. 4 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
502 Gutenberg downloadsen2013Difficulty 68 (Academic)
The Foot-prints of the Creator : $b or, The Asterolepis of Stromness
Miller, Hugh
502 Gutenberg downloadsen2022Difficulty 66 (Academic)
Anthropoid apes
Hartmann, Robert
501 Gutenberg downloadsen2025Difficulty 53 (Graduate)
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.
501 Gutenberg downloadsen2011Difficulty 50 (College)
Lectures on Evolution Essay #3 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
501 Gutenberg downloadsen2001Difficulty 69 (Academic)
Natural History of the Racer Coluber constrictor
Fitch, Henry S. (Henry Sheldon)
501 Gutenberg downloadsen2013Difficulty 69 (Academic)
Recuerdos de mi vida (tomo 2 de 2)
Ramón y Cajal, Santiago
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Scientific American Supplement, No. 324, March 18, 1882
Various
501 Gutenberg downloadsen2005Difficulty 53 (Graduate)
Scientific American Supplement, No. 385, May 19, 1883
Various
501 Gutenberg downloadsen2005Difficulty 58 (Graduate)
Canterbury Pieces
Butler, Samuel
500 Gutenberg downloadsen2002Difficulty 55 (Graduate)
Scientific American Supplement, No. 315, January 14, 1882
Various
499 Gutenberg downloadsen2006Difficulty 63 (Academic)
Studies in the Evolutionary Psychology of Feeling
Stanley, Hiram Miner
499 Gutenberg downloadsen2018Difficulty 62 (Academic)
The Bird Study Book
Pearson, T. Gilbert (Thomas Gilbert)
499 Gutenberg downloadsen2007Difficulty 52 (Graduate)
The Coal Measures Amphibia of North America
Moodie, Roy Lee
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The Interpreters of Genesis and the Interpreters of Nature Essay #4 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
499 Gutenberg downloadsen2001Difficulty 65 (Academic)
Birds in Flight
Pycraft, W. P. (William Plane)
498 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, IV. Band Das Emporblühen der modernen Naturwissenschaften seit der Entdeckung des Energieprinzips
Dannemann, Friedrich
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Louis Pasteur: His Life and Labours
Vallery-Radot, René
498 Gutenberg downloadsen2014Difficulty 59 (Graduate)
On the Study of Zoology
Huxley, Thomas Henry
498 Gutenberg downloadsen2001Difficulty 66 (Academic)
Science from an Easy Chair
Lankester, E. Ray (Edwin Ray), Sir
498 Gutenberg downloadsen2018Difficulty 52 (Graduate)
The Life of an Insect being a history of the changes of insects from the egg to the perfect being.
Unknown
498 Gutenberg downloadsen2014Difficulty 62 (Academic)
First course in biology
Bailey, L. H. (Liberty Hyde) & Coleman, Walter Moore
497 Gutenberg downloadsen2025Difficulty 46 (College)
A Preliminary Revision of the North American Species of Cactus, Anhalonium, and Lophophora
Coulter, John Merle
496 Gutenberg downloadsen1998Difficulty 56 (Graduate)
Regeneration
Morgan, Thomas Hunt
496 Gutenberg downloadsen2018Difficulty 57 (Graduate)
Scientific American Supplement, No. 433, April 19, 1884
Various
496 Gutenberg downloadsen2005Difficulty 66 (Academic)
Charles Darwin
Allen, Grant
495 Gutenberg downloadsen2010Difficulty 73 (Expert)
The works of Francis Maitland Balfour, Volume 2 (of 4) : $b A treatise on comparative embryology: Invertebrata
Balfour, Francis M. (Francis Maitland)
495 Gutenberg downloadsen2014Difficulty 64 (Academic)
Aphorisms and Reflections from the Works of T. H. Huxley
Huxley, Thomas Henry
493 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Hints towards the formation of a more comprehensive theory of life.
Coleridge, Samuel Taylor
493 Gutenberg downloadsen2008Difficulty 68 (Academic)
Island Life; Or, The Phenomena and Causes of Insular Faunas and Floras
Wallace, Alfred Russel
493 Gutenberg downloadsen2010Difficulty 89 (Specialist)
On the Seashore Cassell's "Eyes and No Eyes" Series, Book VII
Smith, R. Cadwallader
493 Gutenberg downloadsen2003Difficulty 35 (High School)
The Fairy-Land of Science
Buckley, Arabella B. (Arabella Burton)
493 Gutenberg downloadsen2004Difficulty 48 (College)
The Avifauna of Micronesia, Its Origin, Evolution, and Distribution
Baker, Rollin H. (Rollin Harold)
492 Gutenberg downloadsen2013Difficulty 61 (Academic)
The Migration of North American Birds (1935)
Lincoln, Frederick Charles
492 Gutenberg downloadsen2021Difficulty 71 (Expert)
Natural Wonders
Brewster, Edwin Tenney
491 Gutenberg downloadsen2015Difficulty 40 (High School)
Scientific American Supplement, No. 829, November 21, 1891
Various
491 Gutenberg downloadsen2005Difficulty 63 (Academic)
The Botanical Magazine, Vol. 05 Or, Flower-Garden Displayed
Curtis, William
491 Gutenberg downloadsen2006Difficulty 57 (Graduate)
Problems of Genetics
Bateson, William
490 Gutenberg downloadsen2014Difficulty 65 (Academic)
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
490 Gutenberg downloadsen2007Difficulty 52 (Graduate)
The Story of Milk
Frederiksen, Johan Ditlev
490 Gutenberg downloadsen2021Difficulty 64 (Academic)
The Toxicity of Caffein: An experimental study on different species of animals
Salant, William & Rieger, J. B. (John Benjamin)
490 Gutenberg downloadsen2014Difficulty 63 (Academic)
Darwin, and After Darwin, Volume 3 of 3 Post-Darwinian Questions: Isolation and Physiological Selection
Romanes, George John
489 Gutenberg downloadsen2011Difficulty 66 (Academic)
Garden Pests in New Zealand A Popular Manual for Practical Gardeners, Farmers and Schools
Miller, David
489 Gutenberg downloadsen2014Difficulty 71 (Expert)
Geological Contemporaneity and Persistent Types of Life
Huxley, Thomas Henry
489 Gutenberg downloadsen2001Difficulty 72 (Expert)
On the Method of Zadig Essay #1 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
489 Gutenberg downloadsen2001Difficulty 66 (Academic)
The Botanical Magazine, Vol. 03 Or, Flower-Garden Displayed
Curtis, William
489 Gutenberg downloadsen2006Difficulty 57 (Graduate)
A Manual of Philippine Birds
McGregor, Richard C. (Richard Crittenden)
487 Gutenberg downloadsen2014Difficulty 68 (Academic)
Handbuch der Pharmakognosie : $b Zweiter Band. Spezielle Pharmakognosie
Tschirch, A. (Alexander)
487 Gutenberg downloadsde2023
Neotropical Hylid Frogs, Genus Smilisca
Duellman, William Edward & Trueb, Linda
487 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Practical Skunk Raising A Book of Information Concerning the Raising of Skunks for Profit
Pratt, William Edwin
487 Gutenberg downloadsen2014Difficulty 40 (High School)
Sea-Weeds, Shells and Fossils
Gray, Peter & Woodward, B. B. (Bernard Bolingbroke)
487 Gutenberg downloadsen2011Difficulty 58 (Graduate)
The Academic Gregories
Stewart, Agnes Grainger
487 Gutenberg downloadsen2016Difficulty 59 (Graduate)
Travels into North America, Volume 2 (of 3)
Kalm, Pehr
487 Gutenberg downloadsen2023Difficulty 47 (College)
Buchanan's Journal of Man, August 1887 Volume 1, Number 7
Unknown
486 Gutenberg downloadsen2008Difficulty 63 (Academic)
Scientific American Supplement, No. 492, June 6, 1885
Various
486 Gutenberg downloadsen2004Difficulty 53 (Graduate)
The honey-bee: its nature, homes and products
Harris, William Hetherington
486 Gutenberg downloadsen2022Difficulty 56 (Graduate)
Flora von Deutschland Ein Hilfsbuch zum Bestimmen der zwischen den deutschen Meeren und den Alpen wildwachsenden und angebauten Pflanzen
Schmeil, O. (Otto) & Fitschen, Jost
485 Gutenberg downloadsde2019
Illustrations of the Birds of California, Texas, Oregon, British and Russian America
Cassin, John
485 Gutenberg downloadsen2021Difficulty 63 (Academic)
Scientific American Supplement, No. 303, October 22, 1881
Various
485 Gutenberg downloadsen2005Difficulty 52 (Graduate)
The flowering plants of South Africa; vol. 3
Pole Evans, I. B. (Illtyd Buller)
485 Gutenberg downloadsen2021Difficulty 52 (Graduate)
Grasses : $b A handbook for use in the field and laboratory
Ward, H. Marshall (Harry Marshall)
484 Gutenberg downloadsen2015Difficulty 56 (Graduate)
On the phenomena of hybridity in the genus Homo
Broca, Paul
484 Gutenberg downloadsen2014Difficulty 66 (Academic)
Physiology
Foster, M. (Michael), Sir
483 Gutenberg downloadsen2016Difficulty 39 (High School)
Criticisms on "The Origin of Species" From 'The Natural History Review', 1864
Huxley, Thomas Henry
482 Gutenberg downloadsen2001Difficulty 64 (Academic)
Scientific American Supplement, No. 601, July 9, 1887
Various
482 Gutenberg downloadsen2004Difficulty 53 (Graduate)
The Birds of Australia, Vol. 5 of 7
Gould, John
482 Gutenberg downloadsen2020Difficulty 61 (Academic)
The Crayfish: An Introduction to the Study of Zoology.
Huxley, Thomas Henry
482 Gutenberg downloadsen2019Difficulty 54 (Graduate)
Appletons' Popular Science Monthly, March 1899 Volume LIV, No. 5, March 1899
Various
481 Gutenberg downloadsen2013Difficulty 57 (Graduate)
Freshwater Sponges, Hydroids & Polyzoa
Annandale, Nelson
480 Gutenberg downloadsen2011Difficulty 61 (Academic)
A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America)
Wellman, John
478 Gutenberg downloadsen2011Difficulty 59 (Graduate)
Desert and water gardens of the Red Sea : $b Being an account of the natives and the shore formations of the coast
Crossland, Cyril
478 Gutenberg downloadsen2023Difficulty 50 (College)
Scientific American, Vol. XXXIX.No. 6. [New Series.], August 10, 1878
Various
478 Gutenberg downloadsen2013Difficulty 54 (Graduate)
The Destiny of Man, Viewed in the Light of His Origin
Fiske, John
478 Gutenberg downloadsen2005Difficulty 65 (Academic)
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
477 Gutenberg downloadsen2001Difficulty 67 (Academic)
Scientific American Supplement No. 822, October 3, 1891
Various
477 Gutenberg downloadsen2005Difficulty 55 (Graduate)
Studies on Fermentation The diseases of beer, their causes, and the means of preventing them
Pasteur, Louis
477 Gutenberg downloadsen2020Difficulty 55 (Graduate)
The physiology of digestion considered with relation to the principles of dietetics
Combe, Andrew
477 Gutenberg downloadsen2023Difficulty 83 (Specialist)
Evolution and creation
Hardwicke, Herbert Junius
476 Gutenberg downloadsen2017Difficulty 64 (Academic)
Scientific American Supplement, No. 417, December 29, 1883
Various
476 Gutenberg downloadsen2005Difficulty 65 (Academic)
Studies in the Theory of Descent, Volume I
Weismann, August
476 Gutenberg downloadsen2015Difficulty 68 (Academic)
The Chautauquan, Vol. 05, April 1885
Chautauqua Literary and Scientific Circle & Chautauqua Institution
476 Gutenberg downloadsen2017Difficulty 54 (Graduate)
The Lives of Celebrated Travellers, Vol. 2 (of 3)
St. John, James Augustus
476 Gutenberg downloadsen2021Difficulty 90 (Specialist)
The Orchid Album, Volume 3 Comprising Coloured Figures and Descriptions of New, Rare, and Beautiful Orchidaceous Plants
Moore, Thomas
476 Gutenberg downloadsen2019Difficulty 57 (Graduate)
Botanical features of the Algerian Sahara
Cannon, William Austin
475 Gutenberg downloadsen2023Difficulty 52 (Graduate)
Life History of the Kangaroo Rat
Vorhies, Charles Taylor & Taylor, Walter P. (Walter Penn)
475 Gutenberg downloadsen2006Difficulty 62 (Academic)
Amphibians and Reptiles of the Rainforests of Southern El Petén, Guatemala
Duellman, William Edward
474 Gutenberg downloadsen2011Difficulty 64 (Academic)
Animal Parasites and Messmates
Beneden, P. J. van (Pierre Joseph)
474 Gutenberg downloadsen2015Difficulty 57 (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
474 Gutenberg downloadsen2014Difficulty 65 (Academic)
De Canibus Britannicis: Of Englishe Dogges
Caius, John
474 Gutenberg downloadsen2008Difficulty 81 (Specialist)
Science and Morals and Other Essays
Windle, Bertram Coghill Alan, Sir
474 Gutenberg downloadsen2008Difficulty 56 (Graduate)
The Lights of the Church and the Light of Science Essay #6 from "Science and Hebrew Tradition"
Huxley, Thomas Henry
474 Gutenberg downloadsen2001Difficulty 70 (Academic)
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
474 Gutenberg downloadsen2001Difficulty 61 (Academic)
Appletons' Popular Science Monthly, July 1899 Volume LV, No. 3, July 1899
Various
473 Gutenberg downloadsen2014Difficulty 58 (Graduate)
The Botanical Magazine, Vol. 02 Or, Flower-Garden Displayed
Curtis, William
473 Gutenberg downloadsen2006Difficulty 57 (Graduate)
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)
472 Gutenberg downloadsen2024Difficulty 59 (Graduate)
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
472 Gutenberg downloadsen2022Difficulty 55 (Graduate)
Roses: or, a Monograph of the Genus Rosa
Andrews, Henry Cranke, active 1799-1828
472 Gutenberg downloadsen2021Difficulty 63 (Academic)
The Pecan and its Culture
Hume, H. Harold (Hardrada Harold)
472 Gutenberg downloadsen2009Difficulty 57 (Graduate)
The zoology of the voyage of H.M.S. Beagle [vol. 2 of 5] : $b Mammalia
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Theory of circulation by respiration : $b synopsis of its principles and history
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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
Buffon, Georges Louis Leclerc, comte de
471 Gutenberg downloadsen2014Difficulty 76 (Expert)
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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471 Gutenberg downloadsen2014Difficulty 61 (Academic)
Himalayan Journals — Volume 1 Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.
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Ideen zu einer Physiognomik der Gewächse
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Scientific American Supplement, No. 358, November 11, 1882
Various
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The Birds of Australia, Vol. 3 of 7
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The Social Direction of Evolution: An Outline of the Science of Eugenics
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471 Gutenberg downloadsen2010Difficulty 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.
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The Story of Creation as Told By Theology and By Science
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Studies on Epidemic Influenza: Comprising Clinical and Laboratory Investigations
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The Vivisectors' Directory Being a list of the licensed vivisectors in the United Kingdom, together with the leading physiologists in foreign laboratories
Unknown
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Quadrupeds, What They Are and Where Found: A Book of Zoology for Boys
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468 Gutenberg downloadsen2007Difficulty 55 (Graduate)
Scientific American Supplement, No. 275, April 9, 1881
Various
468 Gutenberg downloadsen2005Difficulty 57 (Graduate)
Territory in Bird Life
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The botanist's repository for new and rare plants; vol. 09 [of 10]
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Chambers's Elementary Science Readers Book I
Various
467 Gutenberg downloadsen2006Difficulty 27 (Middle School)
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Jaundice: Its Pathology and Treatment With the Application of Physiological Chemistry to the Detection and Treatment of Diseases of the Liver and Pancreas
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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
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467 Gutenberg downloadsen2022Difficulty 63 (Academic)
ABC's of Science
Oliver, Charles A. (Charles Alexander)
466 Gutenberg downloadsen1998Difficulty 51 (Graduate)
An Account of the Insects Noxious to Agriculture and Plants in New Zealand The Scale Insects (Coccididae)
Maskell, William Miles
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Ameboid movement
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465 Gutenberg downloadsen2017Difficulty 66 (Academic)
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
Buffon, Georges Louis Leclerc, comte de
465 Gutenberg downloadsen2014Difficulty 56 (Graduate)
The Mental Life of Monkeys and Apes: A Study of Ideational Behavior
Yerkes, Robert Mearns
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Q. E. D., or New Light on the Doctrine of Creation
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Popular Books on Natural Science For Practical Use in Every Household, for Readers of All Classes
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462 Gutenberg downloadsen2011Difficulty 50 (College)
Scientific American Supplement, No. 455, September 20, 1884
Various
462 Gutenberg downloadsen2004Difficulty 57 (Graduate)
Migration of Birds (1950)
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461 Gutenberg downloadsen2021Difficulty 70 (Academic)
On the Origin and Metamorphoses of Insects
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Science in Arcady
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Studies in the Theory of Descent (Volumes 1 and 2)
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The Evolution of Man Scientifically Disproved in 50 Arguments
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Versuche über Pflanzenhybriden
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Scientific American Supplement, No. 363, December 16, 1882
Various
460 Gutenberg downloadsen2005Difficulty 62 (Academic)
Seed Dispersal
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460 Gutenberg downloadsen2008Difficulty 46 (College)
Yeast
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The Appendages, Anatomy, and Relationships of Trilobites
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459 Gutenberg downloadsen2012Difficulty 67 (Academic)
Travels into North America, Volume 3 (of 3)
Kalm, Pehr
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The Insect
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458 Gutenberg downloadsen2013Difficulty 61 (Academic)
Die Tier- und Pflanzenwelt des Süsswassers. Erster Band.
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Marvels of Pond-life Or, A Year's Microscopic Recreations Among the Polyps, Infusoria, Rotifers, Water-bears and Polyzoa
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New observations on the natural history of bees
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The flowering plants of South Africa; vol. 4
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Heroes of science : $b Botanists, zoologists, and geologists
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Irritability : $b a physiological analysis of the general effect of stimuli in living substance
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456 Gutenberg downloadsen2021Difficulty 65 (Academic)
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"
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The flowering plants of South Africa; vol. 5
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Cassell's book of birds; vol. 2
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Experiments on Animals
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Some Common Birds in Their Relation to Agriculture
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The Genetic Effects of Radiation
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453 Gutenberg downloadsen2017Difficulty 59 (Graduate)
Within the Deep Cassell's "Eyes and No Eyes" Series, Book VIII.
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A Synopsis of the North American Lagomorpha
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452 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Atlas de poche des mammifères de la France, de la Suisse romane et de la Belgique avec leur description, moeurs et organisation
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Ecological Studies of the Timber Wolf in Northeastern Minnesota
Mech, L. David & Frenzel, Louis Daniel & Karns, P. D. & Ream, Robert R. & Winship, John W.
452 Gutenberg downloadsen2011Difficulty 52 (Graduate)
Scientific American Supplement, No. 520, December 19, 1885
Various
452 Gutenberg downloadsen2004Difficulty 56 (Graduate)
Über die Entstehung der Arten im Thier- und Pflanzen-Reich durch natürliche Züchtung
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Appletons' Popular Science Monthly, February 1900 Vol. 56, November, 1899 to April, 1900
Various
451 Gutenberg downloadsen2014Difficulty 62 (Academic)
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
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The chocolate-plant (Theobroma cacao) and its products
Anonymous
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American Addresses, with a Lecture on the Study of Biology
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450 Gutenberg downloadsen2005Difficulty 67 (Academic)
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Scientific American Supplement, No. 595, May 28, 1887
Various
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Select Specimens of Natural History Collected in Travels to Discover the Source of the Nile. Volume 5.
Bruce, James
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The Courtship of Animals
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450 Gutenberg downloadsen2019Difficulty 66 (Academic)
The Organism as a Whole, from a Physicochemical Viewpoint
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The zoology of the voyage of H.M.S. Beagle [vol. 1 of 5] : $b Fossil mammalia
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An introduction to the study of fishes
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Animal Castration
Liautard, Alexandre François Augustin
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Birds from North Borneo University of Kansas Publications, Museum of Natural History, Volume 17, No. 8, pp. 377-433, October 27, 1966
Thompson, Max C.
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Notes and Letters on the Natural History of Norfolk More Especially on the Birds and Fishes
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Our Summer Migrants An Account of the Migratory Birds Which Pass the Summer in the British Islands.
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Pearls & Parasites
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Some Reptiles and Amphibians from Korea
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A Guide for the Study of Animals
Whitney, Worrallo & Lucas, Frederic Colby & Shinn, Harold Brough & Smallwood, Mabel Elizabeth
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Mendelism Third Edition
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Bee Keeping
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Mendel's principles of heredity: A defence
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Physiological economy in nutrition, with special reference to the minimal proteid requirement of the healthy man an experimental study
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The Story of Germ Life
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The cretaceous birds of New Jersey
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446 Gutenberg downloadsen2022Difficulty 69 (Academic)
The Study of Plant Life
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André Michaux's Travels into Kentucky, 1793-96; François André Michaux's Travels West of Alleghany Mountains, 1802; Thaddeus Mason Harris's Journal of a Tour Northwest of Alleghany Mountains, 1803.
Michaux, André & Harris, Thaddeus Mason & Michaux, François André
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Ecological Observations on the Woodrat, Neotoma floridana
Fitch, Henry S. (Henry Sheldon) & Rainey, Dennis G.
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History of Embalming and of Preparations in Anatomy, Pathology, and Natural History; Including an Account of a New Process for Embalming
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445 Gutenberg downloadsen2015Difficulty 78 (Expert)
On Snake-Poison: Its Action and Its Antidote
Mueller, A.
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The Evolution of Man — Volume 2
Haeckel, Ernst
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Coral and Coral Reefs
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Inheritance of Characteristics in Domestic Fowl
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International Weekly Miscellany of Literature, Art and Science — Volume 1, No. 2, July 8, 1850
Various
443 Gutenberg downloadsen2004Difficulty 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)
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The Essentials of Illustration A Practical Guide to the Reproduction of Drawings & Photographs for the Use of Scientists & Others
Hill, Thomas George
442 Gutenberg downloadsen2011Difficulty 58 (Graduate)
The Pleistocene of North America and its vertebrated animals from the states east of the Mississippi River and from the Canadian provinces east of longitude 95°
Hay, Oliver Perry
442 Gutenberg downloadsen2020Difficulty 73 (Expert)
Careers in Atomic Energy
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441 Gutenberg downloadsen2013Difficulty 68 (Academic)
Nouveaux souvenirs entomologiques - Livre II Étude sur l'instinct et les moeurs des insectes
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441 Gutenberg downloadsfr2006
Scientific American Supplement, No. 810, July 11, 1891
Various
441 Gutenberg downloadsen2005Difficulty 51 (Graduate)
The Birds of Australia, Vol. 2 of 7
Gould, John
441 Gutenberg downloadsen2019Difficulty 66 (Academic)
Species Plantarum, Sections VI-X
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The Popular Science Monthly, September, 1900 Vol. 57, May, 1900 to October, 1900
Various
440 Gutenberg downloadsen2014Difficulty 77 (Expert)
Aromatics and the Soul: A Study of Smells
McKenzie, Dan
439 Gutenberg downloadsen2019Difficulty 53 (Graduate)
Discourses: Biological & Geological Essays
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Food Habits of the Thrushes of the United States
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The Dancing Mouse: A Study in Animal Behavior
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The Speech of Monkeys
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A Handbook of Some South Indian Grasses
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438 Gutenberg downloadsen2007Difficulty 50 (College)
Birds, Illustrated by Color Photography, Vol. 1, No. 6 June, 1897
Various
438 Gutenberg downloadsen2009Difficulty 48 (College)
Fossil Butterflies Memoirs of the American Association for the Advancement of Science, I.
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438 Gutenberg downloadsen2017Difficulty 59 (Graduate)
An Experimental Translocation of the Eastern Timber Wolf
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437 Gutenberg downloadsen2011Difficulty 56 (Graduate)
Identifying Hardwoods Growing on Pine Sites
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437 Gutenberg downloadsen2021Difficulty 54 (Graduate)
On the Advisableness of Improving Natural Knowledge
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437 Gutenberg downloadsen2001Difficulty 72 (Expert)
Outlines of Creation
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437 Gutenberg downloadsen2015Difficulty 68 (Academic)
Scientific American Supplement, No. 787, January 31, 1891
Various
437 Gutenberg downloadsen2004Difficulty 53 (Graduate)
The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants
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The Elements of Agriculture A Book for Young Farmers, with Questions Prepared for the Use of Schools
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The House Fly and How to Suppress It
Howard, L. O. (Leland Ossian) & Bishopp, F. C. (Fred Corry)
436 Gutenberg downloadsen2006Difficulty 54 (Graduate)
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
435 Gutenberg downloadsen2014Difficulty 68 (Academic)
Food of the Crow, Corvus brachyrhynchos Brehm, in South-central Kansas
Platt, Dwight R.
435 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Introduction to the Study of Palæontological Botany
Balfour, John Hutton
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Note on the Resemblances and Differences in the Structure and the Development of the Brain in Man and Apes
Huxley, Thomas Henry & Darwin, Charles
435 Gutenberg downloadsen2000Difficulty 66 (Academic)
The Adductor Muscles of the Jaw In Some Primitive Reptiles
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The giant sequoia : $b An account of the history and characteristics of the big trees of California
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A first book in organic evolution
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Venomous arthropod handbook : $b envenomization symptoms/treatment, identification, biology and control
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Biology versus Theology. The Bible: irreconcilable with Science, Experience, and even its own statements
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Comparative Breeding Behavior of Ammospiza caudacuta and A. maritima
Woolfenden, Glen Everett
433 Gutenberg downloadsen2011Difficulty 54 (Graduate)
L'Académie des sciences et les académiciens de 1666 à 1793
Bertrand, Joseph
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Death and resurrection from the point of view of the cell-theory
Björklund, Gustaf
432 Gutenberg downloadsen2019Difficulty 58 (Graduate)
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
Weiss, Carl
432 Gutenberg downloadsde2008
Scientific American Supplement, No. 344, August 5, 1882
Various
432 Gutenberg downloadsen2005Difficulty 54 (Graduate)
The Dwelling House
Poore, George Vivian
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Fathers of Biology
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Illustrations of Exotic Entomology, Volume 3
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Lamarck et son OEuvre
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The Life and Letters of George John Romanes, M.A., LL.D., F.R.S.
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Ants and Some Other Insects: An Inquiry Into the Psychic Powers of These Animals
Forel, Auguste
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Little Busybodies: The Life of Crickets, Ants, Bees, Beetles, and Other Busybodies
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North American Jumping Mice (Genus Zapus)
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430 Gutenberg downloadsen2012Difficulty 64 (Academic)
Appletons' Popular Science Monthly, February 1899 Volume LIV, No. 4, February 1899
Various
429 Gutenberg downloadsen2013Difficulty 57 (Graduate)
De l'origine des espèces
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Die Welträtsel: Gemeinverständliche Studien über Monistische Philosophie
Haeckel, Ernst
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Life Movements in Plants, Volume I
Bose, Jagadis Chandra
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The Evolutionist at Large
Allen, Grant
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The Last Link: Our Present Knowledge of the Descent of Man
Haeckel, Ernst
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La simulación en la lucha por la vida
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Lehrbuch der Botanik für Hochschulen
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Seaside Studies in Natural History. Marine Animals of Massachusetts Bay. Radiates.
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428 Gutenberg downloadsen2011Difficulty 52 (Graduate)
The Atom and the Ocean
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428 Gutenberg downloadsen2021Difficulty 61 (Academic)
Through a Microscope Something of the Science, Together with many Curious Observations Indoor and Out and Directions for a Home-made Microscope.
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Life among the butterflies
Randolph, Vance
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The Philosophy Which Shows the Physiology of Mesmerism and Explains the Phenomenon of Clairvoyance
Pasley, T. H.
427 Gutenberg downloadsen2015Difficulty 74 (Expert)
An ethical problem; or, Sidelights upon scientific experimentation on man and animals
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426 Gutenberg downloadsen2006Difficulty 64 (Academic)
Radioisotopes and Life Processes (Revised)
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426 Gutenberg downloadsen2015Difficulty 66 (Academic)
Biology : $b A lecture delivered at Columbia University in the series on Science, Philosophy and Art November 20, 1907
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The Botanical Magazine, Vol. 08 Or, Flower-Garden Displayed
Curtis, William
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The Popular Science Monthly, October, 1900 Vol. 57, May, 1900 to October, 1900
Various
425 Gutenberg downloadsen2014Difficulty 75 (Expert)
A bacteriological study of ham souring
McBryde, Charles Neil
423 Gutenberg downloadsen2022Difficulty 59 (Graduate)
Mushroom and Toadstools How to Distinguish Easily the Differences Between Edible and Poisonous Fungi
Smith, Worthington George
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Relics of Primeval Life: Beginning of Life in the Dawn of Geological Time
Dawson, John William, Sir
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Scientific American Supplement, No. 388, June 9, 1883
Various
423 Gutenberg downloadsen2005Difficulty 56 (Graduate)
The Brain and the Voice in Speech and Song
Mott, F. W. (Frederick Walker)
423 Gutenberg downloadsen2004Difficulty 68 (Academic)
The Factors of Organic Evolution
Spencer, Herbert
423 Gutenberg downloadsen2016Difficulty 70 (Academic)
Bog-trotting for orchids
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422 Gutenberg downloadsen2025Difficulty 61 (Academic)
Het Leven der Dieren. Deel 3. Afdeling 2. De Visschen
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The Scientific Evidences of Organic Evolution
Romanes, George John
422 Gutenberg downloadsen2006Difficulty 67 (Academic)
British Butterflies: Figures and Descriptions of Every Native Species
Coleman, W. S. (William Stephen)
421 Gutenberg downloadsen2010Difficulty 65 (Academic)
The Biological Problem of To-day: Preformation Or Epigenesis? The Basis of a Theory of Organic Development
Hertwig, Oscar
421 Gutenberg downloadsen2011Difficulty 67 (Academic)
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
421 Gutenberg downloadsen2001Difficulty 66 (Academic)
The Sense of Taste
Hollingworth, Harry L. (Harry Levi) & Poffenberger, Albert T. (Albert Theodore)
421 Gutenberg downloadsen2019Difficulty 69 (Academic)
Appletons' Popular Science Monthly, May, 1900 Vol. 57, May, 1900 to October, 1900
Various
420 Gutenberg downloadsen2014Difficulty 60 (Graduate)
Mammals of Northwestern South Dakota
Andersen, Kenneth W. & Jones, J. Knox
420 Gutenberg downloadsen2010Difficulty 50 (College)
Mimicry in Butterflies
Punnett, Reginald Crundall
420 Gutenberg downloadsen2013Difficulty 62 (Academic)
Dans la Haute-Gambie : $b Voyage d'exploration scientifique, 1891-1892
Rançon, A. (André)
418 Gutenberg downloadsfr2024
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)
418 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Nouvel atlas de poche des champignons Comestibles et Vénéneux les plus répandus. Série II (Première édition)
Dumée, Paul
417 Gutenberg downloadsfr2017
Studies in the Theory of Descent, Volume II
Weismann, August
417 Gutenberg downloadsen2015Difficulty 65 (Academic)
The plurality of the human race
Pouchet, G. (Georges)
417 Gutenberg downloadsen2023Difficulty 61 (Academic)
Die epiphytische Vegetation Amerikas
Schimper, A. F. W. (Andreas Franz Wilhelm)
416 Gutenberg downloadsde2007
The Flea
Russell, Harold
416 Gutenberg downloadsen2014Difficulty 53 (Graduate)
Zoological Illustrations, Second Series, Volume 2 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
416 Gutenberg downloadsen2013Difficulty 60 (Graduate)
A Hand-book to the Primates, Volume 2 (of 2)
Forbes, Henry O. (Henry Ogg)
415 Gutenberg downloadsen2013Difficulty 54 (Graduate)
Gorillas & Chimpanzees
Garner, R. L. (Richard Lynch)
415 Gutenberg downloadsen2013Difficulty 51 (Graduate)
Insect manufactures
Anonymous
415 Gutenberg downloadsen2024Difficulty 60 (Graduate)
Little Masterpieces of Science: The Naturalist as Interpreter and Seer
Unknown
415 Gutenberg downloadsen2009Difficulty 63 (Academic)
Harvey's Views on the Use of the Circulation of the Blood
Curtis, John Green
414 Gutenberg downloadsen2014Difficulty 69 (Academic)
Supplement to the catalogue of seals and whales in the British Museum
Gray, John Edward
414 Gutenberg downloadsen2023Difficulty 45 (College)
The ethics of Hercules : $b A study of man's body as the sole determinant of ethical values
Givler, Robert Chenault
414 Gutenberg downloadsen2023Difficulty 63 (Academic)
The Recent Mammals of Tamaulipas, México
Alvarez, Ticul
414 Gutenberg downloadsen2012Difficulty 56 (Graduate)
Evolution
Watson, James A. S. (James Anderson Scott)
413 Gutenberg downloadsen2016Difficulty 60 (Graduate)
Evolution of Life and Form Four lectures delivered at the twenty-third anniversary meeting of the Theosophical Society at Adyar, Madras, 1898
Besant, Annie
413 Gutenberg downloadsen2012Difficulty 60 (Graduate)
A Synopsis of the American Bats of the Genus Pipistrellus
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
412 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Greek Biology & Greek Medicine
Singer, Charles
412 Gutenberg downloadsen2020Difficulty 56 (Graduate)
Jelly-Fish, Star-Fish, and Sea-Urchins: Being a Research on Primitive Nervous Systems
Romanes, George John
412 Gutenberg downloadsen2014Difficulty 64 (Academic)
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
412 Gutenberg downloadsen2015Difficulty 58 (Graduate)
On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment
Bourguignon, Honoré
412 Gutenberg downloadsen2011Difficulty 69 (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
411 Gutenberg downloadsen2013Difficulty 48 (College)
Being Well-Born: An Introduction to Eugenics
Guyer, Michael F. (Michael Frederic)
411 Gutenberg downloadsen2012Difficulty 85 (Specialist)
British Sea Birds
Dixon, Charles
411 Gutenberg downloadsen2014Difficulty 61 (Academic)
Hormones and Heredity A Discussion of the Evolution of Adaptations and the Evolution of Species
Cunningham, J. T. (Joseph Thomas)
411 Gutenberg downloadsen2005Difficulty 73 (Expert)
Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man
Benedict, Francis Gano & Carpenter, Thorne M. (Thorne Martin)
411 Gutenberg downloadsen2009Difficulty 65 (Academic)
Scientific American Supplement, No. 441, June 14, 1884.
Various
411 Gutenberg downloadsen2005Difficulty 56 (Graduate)
Birds' Nests, Eggs and Egg-Collecting
Kearton, Richard
410 Gutenberg downloadsen2014Difficulty 65 (Academic)
Development of the Digestive Canal of the American Alligator
Reese, A. M. (Albert Moore)
410 Gutenberg downloadsen2007Difficulty 58 (Graduate)
Texas Honey Plants
Sanborn, Charles Emerson & Scholl, Ernest E. (Ernest Emmett)
410 Gutenberg downloadsen2012Difficulty 53 (Graduate)
Appletons' Popular Science Monthly, March 1900 Vol. 56, Nov. 1899 to April, 1900
Various
409 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Bananas: Nature's Institution for the Promotion of Laziness
Perry, Edward Wilkin
409 Gutenberg downloadsen2017Difficulty 52 (Graduate)
Beginners' zoology
Coleman, Walter Moore
409 Gutenberg downloadsen2024Difficulty 46 (College)
Mammals of the San Gabriel Mountains of California
Vaughan, Terry A.
409 Gutenberg downloadsen2011Difficulty 63 (Academic)
The illustrated story of evolution
Gauvin, Marshall J. (Marshall Jerome)
408 Gutenberg downloadsen2023Difficulty 54 (Graduate)
A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation'
Bowen, Francis
407 Gutenberg downloadsen2008Difficulty 67 (Academic)
Die Cellularpathologie in ihrer Begründung auf physiologische und pathologische Gewebelehre
Virchow, Rudolf
407 Gutenberg downloadsde2014
The Kansas University Quarterly, Vol. I, No. 1 (1892)
Various
406 Gutenberg downloadsen2017Difficulty 58 (Graduate)
Grundriß der menschlichen Erblichkeitslehre und Rassenhygiene (2/2) Menschliche Auslese und Rassenhygiene
Lenz, Fritz
405 Gutenberg downloadsde2015
Keys to Fungi on Dung
Richardson, M. J. (Michael J.) & Watling, Roy
405 Gutenberg downloadsen2018Difficulty 57 (Graduate)
Scientific Essays and Lectures
Kingsley, Charles
405 Gutenberg downloadsen2003Difficulty 56 (Graduate)
The Body at Work: A Treatise on the Principles of Physiology
Hill, Alex
405 Gutenberg downloadsen2020Difficulty 54 (Graduate)
The Minor Horrors of War
Shipley, A. E. (Arthur Everett), Sir
405 Gutenberg downloadsen2021Difficulty 51 (Graduate)
Appletons' Popular Science Monthly, November 1898 Volume 54, November 1898
Various
404 Gutenberg downloadsen2013Difficulty 60 (Graduate)
House Rats and Mice
Lantz, David E. (David Ernest)
404 Gutenberg downloadsen2011Difficulty 51 (Graduate)
Last Words on Evolution: A Popular Retrospect and Summary
Haeckel, Ernst
404 Gutenberg downloadsen2016Difficulty 68 (Academic)
Phylogeny of the Waxwings and Allied Birds
Arvey, M. Dale (Martin Dale)
404 Gutenberg downloadsen2010Difficulty 66 (Academic)
Memoir on the Dodo (Didus ineptus, Linn.)
Owen, Richard
403 Gutenberg downloadsen2025Difficulty 57 (Graduate)
The Botanical Magazine, Vol. 10 Or, Flower-Garden Displayed
Curtis, William
403 Gutenberg downloadsen2020Difficulty 57 (Graduate)
A Review of the Frogs of the Hyla bistincta Group
Duellman, William Edward
402 Gutenberg downloadsen2010Difficulty 60 (Graduate)
The Breeding Birds of Kansas
Johnston, Richard F.
402 Gutenberg downloadsen2011Difficulty 74 (Expert)
Which Shall Live—Men or Animals?
Baynes, Ernest Harold
402 Gutenberg downloadsen2021Difficulty 61 (Academic)
Den Hunting as a Means of Coyote Control
Young, Stanley Paul & Dobyns, Harold Warren
401 Gutenberg downloadsen2015Difficulty 49 (College)
Essays on Darwinism
Stebbing, Thomas Roscoe Rede
401 Gutenberg downloadsen2015Difficulty 63 (Academic)
The Edinburgh New Philosophical Journal, Vol. XLIX April-October 1850
Various
401 Gutenberg downloadsen2013Difficulty 66 (Academic)
The Botanical Magazine, Vol. 13 Or, Flower-Garden Displayed
Curtis, William & Sims, John
400 Gutenberg downloadsen2013Difficulty 58 (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
399 Gutenberg downloadsen2004Difficulty 64 (Academic)
Essays in Natural History and Agriculture
Garnett, Thomas
399 Gutenberg downloadsen2006Difficulty 64 (Academic)
The micro-organisms of the soil
Russell, Edward J. (Edward John) & Rothamsted Experimental Station
399 Gutenberg downloadsen2022Difficulty 62 (Academic)
Duality of Voice
Sutro, Emil
398 Gutenberg downloadsen2015Difficulty 63 (Academic)
Earthworms and Their Allies
Beddard, Frank E. (Frank Evers)
398 Gutenberg downloadsen2013Difficulty 59 (Graduate)
European Fungus Flora: Agaricaceae
Massee, George
398 Gutenberg downloadsen2010Difficulty 48 (College)
New England Salmon Hatcheries and Salmon Fisheries in the Late 19th Century
Various
398 Gutenberg downloadsen2005Difficulty 53 (Graduate)
An Elementary Text-book of the Microscope including a description of the methods of preparing and mounting objects, etc.
Griffith, J. W. (John William)
397 Gutenberg downloadsen2015Difficulty 52 (Graduate)
Louis Agassiz as a Teacher; illustrative extracts on his method of instruction
Cooper, Lane
397 Gutenberg downloadsen2004Difficulty 56 (Graduate)
Illustrations of Exotic Entomology, Volume 2
Drury, Dru
396 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Les énigmes de l'Univers
Haeckel, Ernst
396 Gutenberg downloadsfr2012
Embryology: The Beginnings of Life
Leighton, Gerald R. (Gerald Rowley)
395 Gutenberg downloadsen2011Difficulty 59 (Graduate)
Rede, gehalten bei der Eröffnung der Versammlung deutscher Naturforscher und Ärzte in Berlin, am 18. September 1828
Humboldt, Alexander von
395 Gutenberg downloadsde2007
Geographic Variation in the Pocket Gopher, Thomomys bottae, in Colorado
Youngman, Phillip M.
394 Gutenberg downloadsen2011Difficulty 57 (Graduate)
Het Leven der Dieren: Deel 1, Hoofdstuk 01: De Apen
Brehm, Alfred Edmund
394 Gutenberg downloadsnl2005
Ilex cassine, the aboriginal North American tea $b Its history, distribution, and use among the native North American Indians
Hale, Edwin M. (Edwin Moses)
394 Gutenberg downloadsen2023Difficulty 52 (Graduate)
Intelligence in Plants and Animals Being a New Edition of the Author's Privately Issued "Soul and Immortality."
Gentry, Thomas G. (Thomas George)
394 Gutenberg downloadsen2021Difficulty 71 (Expert)
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
393 Gutenberg downloadsen2017Difficulty 67 (Academic)
Grundzüge der Paläontologie (Paläozoologie). 1. Abteilung: Invertebrata.
Zittel, Karl Alfred von
393 Gutenberg downloadsde2023
Natural History of the Bell Vireo, Vireo bellii Audubon
Barlow, Jon C.
393 Gutenberg downloadsen2010Difficulty 59 (Graduate)
The Gospel of Evolution From "The Atheistic Platform", Twelve Lectures
Aveling, Edward B.
393 Gutenberg downloadsen2011Difficulty 55 (Graduate)
Colouration in Animals and Plants
Tylor, Alfred
392 Gutenberg downloadsen2014Difficulty 56 (Graduate)
Flytraps and Their Operation [1930]
Bishopp, F. C. (Fred Corry)
392 Gutenberg downloadsen2020Difficulty 51 (Graduate)
Middle American Frogs of the Hyla microcephala Group
Duellman, William Edward & Fouquette, M. J.
392 Gutenberg downloadsen2010Difficulty 66 (Academic)
On Germinal Selection as a Source of Definite Variation
Weismann, August
392 Gutenberg downloadsen2010Difficulty 69 (Academic)
Archimedes; or, the future of physics
Whyte, Lancelot Law
391 Gutenberg downloadsen2025Difficulty 66 (Academic)
British Museum (Natural History) General Guide
British Museum (Natural History)
391 Gutenberg downloadsen2018Difficulty 69 (Academic)
Myology and Serology of the Avian Family Fringillidae: A Taxonomic Study
Stallcup, William B.
391 Gutenberg downloadsen2010Difficulty 65 (Academic)
Section Cutting and Staining A practical introduction to histological methods for students and practitioners
Colman, Walter S.
391 Gutenberg downloadsen2016Difficulty 50 (College)
Useful Knowledge: Volume 3. Animals Or, a familiar account of the various productions of nature
Bingley, William
391 Gutenberg downloadsen2018Difficulty 54 (Graduate)
A Mechanico-Physiological Theory of Organic Evolution
Nägeli, Carl
390 Gutenberg downloadsen2010Difficulty 74 (Expert)
Birds from Coahuila, Mexico
Urban, Emil K.
390 Gutenberg downloadsen2008Difficulty 55 (Graduate)
Prehistoric man
Duckworth, W. L. H. (Wynfrid Laurence Henry)
390 Gutenberg downloadsen2013Difficulty 57 (Graduate)
Scientific American Supplement, No. 794, March 21, 1891
Various
390 Gutenberg downloadsen2005Difficulty 52 (Graduate)
The Brain, A Decoded Enigma
Moisa, Dorin Teodor
390 Gutenberg downloadsen2005Difficulty 58 (Graduate)
The Popular Science Monthly, June, 1900 Vol. 57, May, 1900 to October, 1900
Various
390 Gutenberg downloadsen2014Difficulty 69 (Academic)
A conchological manual
Sowerby, G. B. (George Brettingham)
389 Gutenberg downloadsen2013Difficulty 64 (Academic)
A New Subspecies of Lizard, Cnemidophorus sacki, from Michoacán, México
Duellman, William Edward
389 Gutenberg downloadsen2010Difficulty 58 (Graduate)
De afstamming van den mensch en de seksueele teeltkeus, deel 1 (van 2)
Darwin, Charles
389 Gutenberg downloadsnl2022
The Philosophy of Health; Volume 1 (of 2) or, an exposition of the physical and mental constitution of man
Smith, Southwood
389 Gutenberg downloadsen2019Difficulty 73 (Expert)
On the origin of inflammation of the veins and of the causes, consequences, and treatment of purulent deposits
Lee, Henry, M.D.
388 Gutenberg downloadsen2014Difficulty 65 (Academic)
Schutz- und Trutzbündnisse in der Natur
Bölsche, Wilhelm
388 Gutenberg downloadsde2015
Speciation of the Wandering Shrew
Findley, James S. (James Smith)
388 Gutenberg downloadsen2011Difficulty 62 (Academic)
The Doctrine of Evolution: Its Basis and Its Scope
Crampton, Henry Edward
388 Gutenberg downloadsen2005Difficulty 65 (Academic)
Woher die Kindlein kommen
Hoppeler, Hans
388 Gutenberg downloadsde2009
Aspects of plant life; with special reference to the British flora
Praeger, R. Lloyd (Robert Lloyd)
387 Gutenberg downloadsen2018Difficulty 59 (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)
387 Gutenberg downloadsen2010Difficulty 67 (Academic)
Flytraps and Their Operation [1921]
Bishopp, F. C. (Fred Corry)
387 Gutenberg downloadsen2020Difficulty 48 (College)
The Behavior of the Honey Bee in Pollen Collecting
Casteel, Dana Brackenridge
387 Gutenberg downloadsen2012Difficulty 54 (Graduate)
The Darwinian Hypothesis
Huxley, Thomas Henry
387 Gutenberg downloadsen2001Difficulty 69 (Academic)
A Bilateral Division of the Parietal Bone in a Chimpanzee; with a Special Reference to the Oblique Sutures in the Parietal
Hrdlička, Aleš
386 Gutenberg downloadsen2010Difficulty 65 (Academic)
A Review of the Middle American Tree Frogs of the Genus Ptychohyla
Duellman, William Edward
386 Gutenberg downloadsen2011Difficulty 58 (Graduate)
A Statistical Inquiry Into the Nature and Treatment of Epilepsy
Bennett, Alexander Hughes
386 Gutenberg downloadsen2011Difficulty 44 (College)
Biological analogies in history
Roosevelt, Theodore
386 Gutenberg downloadsen2023Difficulty 70 (Academic)
Journal of Entomology and Zoology, Vol. 11, No. 1, March 1919
Various
386 Gutenberg downloadsen2014Difficulty 62 (Academic)
Sphinx Vespiformis: An Essay
Newman, Edward
386 Gutenberg downloadsen2013Difficulty 73 (Expert)
Flowers of mountain and plain
Clements, Edith S. (Edith Schwartz)
385 Gutenberg downloadsen2014Difficulty 50 (College)
An elementary manual of New Zealand entomology : $b being an introduction to the study of our native insects
Hudson, G. V. (George Vernon)
384 Gutenberg downloadsen2013Difficulty 54 (Graduate)
De Reis om de Wereld
Darwin, Charles
384 Gutenberg downloadsnl2010
God and the World: A Survey of Thought
Robinson, Arthur William
384 Gutenberg downloadsen2009Difficulty 60 (Graduate)
Journal of Entomology and Zoology, Vol. 11, No. 4, December 1919
Various
384 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Scientific American Supplement, No. 613, October 1, 1887
Various
384 Gutenberg downloadsen2005Difficulty 63 (Academic)
Treatise on the Anatomy and Physiology of the Mucous Membranes With Illustrative Pathological Observations
Bichat, Xavier
384 Gutenberg downloadsen2016Difficulty 67 (Academic)
A Monograph of Odontoglossum
Bateman, Jas. (James)
383 Gutenberg downloadsen2014Difficulty 61 (Academic)
Systematic Status of the Colubrid Snake, Leptodeira discolor Günther
Duellman, William Edward
383 Gutenberg downloadsen2011Difficulty 63 (Academic)
Use of the Dead to the Living
Smith, Southwood
383 Gutenberg downloadsen2018Difficulty 67 (Academic)
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
382 Gutenberg downloadsen2006Difficulty 57 (Graduate)
A Taxonomic Study of the Middle American Snake, Pituophis deppei
Duellman, William Edward
382 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Het paddenstoelenboekje
Cool, Cath. (Catharina) & Lek, H. A. A. van der (Hendrik Adrianus Abraham)
382 Gutenberg downloadsnl2015
Little Wanderers
Morley, Margaret Warner
382 Gutenberg downloadsen2020Difficulty 41 (College)
Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains
Fitch, Henry S. (Henry Sheldon) & Maslin, T. Paul
382 Gutenberg downloadsen2010Difficulty 66 (Academic)
The Forest Habitat of the University of Kansas Natural History Reservation
Fitch, Henry S. (Henry Sheldon) & McGregor, Ronald L.
382 Gutenberg downloadsen2010Difficulty 59 (Graduate)
The Hand Phrenologically Considered Being a Glimpse at the Relation of the Mind with the Organisation of the Body
Anonymous
382 Gutenberg downloadsen2016Difficulty 70 (Academic)
Marxism and Darwinism : $b Evidence, speeches, and papers in its favour
Pannekoek, Anton
381 Gutenberg downloadsen2023Difficulty 58 (Graduate)
Mushrooms of America, Edible and Poisonous
Unknown
381 Gutenberg downloadsen2009Difficulty 49 (College)
Race Improvement; or, Eugenics: A Little Book on a Great Subject
Baker, La Reine Helen McKenzie
381 Gutenberg downloadsen2015Difficulty 63 (Academic)
Systematics of Megachiropteran Bats in the Solomon Islands
Phillips, Carleton J.
381 Gutenberg downloadsen2012Difficulty 58 (Graduate)
The History of the European Fauna
Scharff, R. F. (Robert Francis)
381 Gutenberg downloadsen2010Difficulty 61 (Academic)
The human foot and the human hand
Humphry, George Murray, Sir
381 Gutenberg downloadsen2025Difficulty 48 (College)
The Subspecific Status of Two Central American Sloths
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
381 Gutenberg downloadsen2010Difficulty 62 (Academic)
Geographic Range of the Hooded Skunk, Mephitis macroura With Description of a New Subspecies from Mexico
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
380 Gutenberg downloadsen2010Difficulty 57 (Graduate)
The Arena, Volume 18, No. 93, August, 1897
Various
380 Gutenberg downloadsen2010Difficulty 51 (Graduate)
The Subspecies of the Mountain Chickadee
Grinnell, Joseph
380 Gutenberg downloadsen2010Difficulty 50 (College)
Popular Lectures on Zoonomia Or The Laws of Animal Life, in Health and Disease
Garnett, Thomas
379 Gutenberg downloadsen2009Difficulty 59 (Graduate)
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.
379 Gutenberg downloadsen2008Difficulty 52 (Graduate)
A Critique of the Theory of Evolution
Morgan, Thomas Hunt
378 Gutenberg downloadsen2009Difficulty 57 (Graduate)
Degeneration: A Chapter in Darwinism
Lankester, E. Ray (Edwin Ray), Sir
378 Gutenberg downloadsen2019Difficulty 66 (Academic)
Grundzüge der Paläontologie (Paläozoologie). 2. Abteilung: Vertebrata.
Zittel, Karl Alfred von
378 Gutenberg downloadsde2025
Sanitation in Panama
Gorgas, William Crawford
378 Gutenberg downloadsen2023Difficulty 56 (Graduate)
Descriptive Zoopraxography; or, the science of animal locomotion made popular
Muybridge, Eadweard
377 Gutenberg downloadsen2012Difficulty 72 (Expert)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, I. Band Von den Anfängen bis zum Wiederaufleben der Wissenschaften
Dannemann, Friedrich
377 Gutenberg downloadsde2016
Evolution Social and Organic
Lewis, Arthur M. (Arthur Morrow)
377 Gutenberg downloadsen2018Difficulty 57 (Graduate)
Evolution: Its nature, its evidence, and its relation to religious thought
LeConte, Joseph
377 Gutenberg downloadsen2014Difficulty 88 (Specialist)
Mazedonien : $b Erlebnisse und Beobachtungen eines Naturforschers im Gefolge des deutschen Heeres
Doflein, Franz
377 Gutenberg downloadsde2023
Physiology and histology of the Cubomedusæ including Dr. F.S. Conant's notes on the physiology
Berger, E. W. (Edward William)
377 Gutenberg downloadsen2017Difficulty 62 (Academic)
Chambers's Journal of Popular Literature, Science, and Art, No. 683 January 27, 1877
Various
376 Gutenberg downloadsen2014Difficulty 50 (College)
Grundriß der menschlichen Erblichkeitslehre und Rassenhygiene (1/2) Menschliche Erblichkeitslehre
Baur, Erwin & Fischer, Eugen & Lenz, Fritz
376 Gutenberg downloadsde2015
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
Marsh, Sylvester
376 Gutenberg downloadsen2017Difficulty 61 (Academic)
Essays in eugenics
Galton, Francis
375 Gutenberg downloadsen2024Difficulty 59 (Graduate)
Evolution: An Investigation and a Critique
Graebner, Theodore
375 Gutenberg downloadsen2006Difficulty 62 (Academic)
Notes on Philippine Birds Collected by Governor W. Cameron Forbes Bulletin of the Museum of Comparative Zoölogy at Harvard College, Vol. LXV. No. 4.
Bangs, Outram
374 Gutenberg downloadsen2011Difficulty 49 (College)
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
374 Gutenberg downloadsen2021Difficulty 52 (Graduate)
Variation in the Muscles and Nerves of the Leg in Two Genera of Grouse (Tympanuchus and Pedioecetes)
Holmes, E. Bruce
374 Gutenberg downloadsen2013Difficulty 55 (Graduate)
Μικρά Φυσικά, Τόμος Πρώτος
Aristotle
374 Gutenberg downloadsel2009
A Discourse on the Plague
Mead, Richard
373 Gutenberg downloadsen2010Difficulty 61 (Academic)
A Field Study of the Kansas Ant-Eating Frog, Gastrophryne olivacea
Fitch, Henry S. (Henry Sheldon)
373 Gutenberg downloadsen2010Difficulty 55 (Graduate)
A Quantitative Study of the Nocturnal Migration of Birds
Lowery, George H., Jr.
373 Gutenberg downloadsen2011Difficulty 55 (Graduate)
An Examination of Weismannism
Romanes, George John
373 Gutenberg downloadsen2015Difficulty 74 (Expert)
Beautiful Ferns
Eaton, Daniel Cady
373 Gutenberg downloadsen2014Difficulty 58 (Graduate)
Descripción Geografica, Histórica y Estadística de Bolivia, Tomo 1.
Orbigny, Alcide Dessalines d'
373 Gutenberg downloadses2004
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
373 Gutenberg downloadsen2022Difficulty 64 (Academic)
Scientific American Supplement, No. 664, September 22,1888
Various
373 Gutenberg downloadsen2008Difficulty 58 (Graduate)
The Mammals of Warren Woods, Berrien County, Michigan Occasional Paper of the Museum of Zoology, Number 86
Dice, Lee R. (Lee Raymond)
373 Gutenberg downloadsen2010Difficulty 49 (College)
Adequate Preparation for the Teacher of Biological Sciences in Secondary Schools
McDonald, J. Daley (James Daley)
372 Gutenberg downloadsen2010Difficulty 64 (Academic)
Atoms, Nature, and Man: Man-made Radioactivity in the Environment
Hines, Neal O.
372 Gutenberg downloadsen2015Difficulty 68 (Academic)
Experiments and Observations Relative to the Influence Lately Discovered by M. Galvani and Commonly Called Animal Electricity
Fowler, Richard
372 Gutenberg downloadsen2014Difficulty 64 (Academic)
Field Mice as Farm and Orchard Pests
Lantz, David E. (David Ernest)
372 Gutenberg downloadsen2013Difficulty 54 (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
372 Gutenberg downloadsen2019Difficulty 48 (College)
Little Masterpieces of Science: Health and Healing
Unknown
372 Gutenberg downloadsen2014Difficulty 53 (Graduate)
Studies of Birds Killed in Nocturnal Migration
Tordoff, Harrison Bruce & Mengel, Robert Morrow
372 Gutenberg downloadsen2016Difficulty 54 (Graduate)
The Ohio naturalist, Vol. 1, No. 4, February 1901
Ohio State University. Biological Club
372 Gutenberg downloadsen2022Difficulty 49 (College)
Whale Primer, with Special Attention to the California Gray Whale
Walker, Theodore J.
371 Gutenberg downloadsen2019Difficulty 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
370 Gutenberg downloadsen2016Difficulty 49 (College)
Natur und Mensch Sechs Abschnitte aus Werken von Ernst Haeckel
Haeckel, Ernst
370 Gutenberg downloadsde2015
Rudiments of Conchology Intended as a familiar introduction to the science.
Venning, Mary Anne
370 Gutenberg downloadsen2015Difficulty 49 (College)
The Popular Science Monthly, July, 1900 Vol. 57, May, 1900 to October, 1900
Various
370 Gutenberg downloadsen2014Difficulty 56 (Graduate)
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)
369 Gutenberg downloadsen2019Difficulty 61 (Academic)
Humanity to Honey-Bees or, Practical Directions for the Management of Honey-Bees Upon an Improved and Humane Plan, by Which the Lives of Bees May Be Preserved, and Abundance of Honey of a Superior Quality May Be Obtained
Nutt, Thomas
369 Gutenberg downloadsen2018Difficulty 65 (Academic)
The American Apiculturist. Vol. III. No. 6, June 15, 1885 A Journal Devoted to Scientific and Practical Beekeeping
Various
369 Gutenberg downloadsen2018Difficulty 54 (Graduate)
The Ohio naturalist, Vol. 1, No. 3, January, 1901
Ohio State University. Biological Club
369 Gutenberg downloadsen2023Difficulty 53 (Graduate)
The Vitamine Manual
Eddy, Walter Hollis
369 Gutenberg downloadsen2005Difficulty 58 (Graduate)
The House We Live In; or, The Making of the Body
Farnsworth, Vesta J.
368 Gutenberg downloadsen2021Difficulty 31 (High School)
The Microscope
Ross, Andrew
368 Gutenberg downloadsen2013Difficulty 65 (Academic)
The suppression of tuberculosis $b Together with observations concerning phthisiogenesis in man and animals and suggestions concerning the hygiene of cow stables and the production of milk for infant-feeding, with special reference to tuberculosis
Behring, Emil von
368 Gutenberg downloadsen2023Difficulty 67 (Academic)
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
367 Gutenberg downloadsen2010Difficulty 54 (Graduate)
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
367 Gutenberg downloadsde2024
The Forests of Mount Rainier National Park
Allen, G. F. (Grenville F.)
367 Gutenberg downloadsen2010Difficulty 49 (College)
Aspects of Reproduction and Development in the Prairie Vole (Microtus ochrogaster)
Fitch, Henry S. (Henry Sheldon)
366 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Birds and Nature Vol. 09 No. 3 [March 1901]
Various
366 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Disease in captive wild mammals and birds : $b incidence, description, comparison
Fox, Herbert
366 Gutenberg downloadsen2025Difficulty 55 (Graduate)
Het Leven der Dieren, Deel 3, Hoofdstuk 04: De Insecten
Brehm, Alfred Edmund
366 Gutenberg downloadsnl2020
Het Leven der Dieren: Deel 2, Hoofdstuk 04: De Hoendervogels
Brehm, Alfred Edmund
366 Gutenberg downloadsnl2009
The Kingdom of Man
Lankester, E. Ray (Edwin Ray), Sir
366 Gutenberg downloadsen2019Difficulty 61 (Academic)
The Mammals of Washtenaw County, Michigan Occasional Papers of the Museum of Zoology, No. 123
Wood, Norman Asa
366 Gutenberg downloadsen2010Difficulty 44 (College)
Time and Life: Mr. Darwin's "Origin of Species"
Huxley, Thomas Henry
366 Gutenberg downloadsen2001Difficulty 72 (Expert)
Fish Populations, Following a Drought, in the Neosho and Marais des Cygnes Rivers of Kansas
Deacon, James E.
365 Gutenberg downloadsen2010Difficulty 52 (Graduate)
Natural History of the Prairie Vole (Mammalian Genus Microtus) [KU. Vol. 1 No. 7]
Jameson, E. W. (Everett Williams)
365 Gutenberg downloadsen2011Difficulty 52 (Graduate)
The Meaning of Infancy
Fiske, John
365 Gutenberg downloadsen2004Difficulty 62 (Academic)
Barium: A Cause of the Loco-Weed Disease
Crawford, Albert C. (Albert Cornelius)
364 Gutenberg downloadsen2012Difficulty 57 (Graduate)
Histoire naturelle des oiseaux d'Afrique, t. 1
Le Vaillant, François
364 Gutenberg downloadsfr2018
Journal of Entomology and Zoology, Vol. 09, No. 1, March 1917
Various
364 Gutenberg downloadsen2015Difficulty 53 (Graduate)
Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 The Ascomycetes of Ohio IV and V
Fink, Bruce & Hilker, Leafy Jane Corrington
364 Gutenberg downloadsen2006Difficulty 58 (Graduate)
Water Reptiles of the Past and Present
Williston, Samuel Wendell
364 Gutenberg downloadsen2022Difficulty 63 (Academic)
Subspeciation in the Kangaroo Rat, Dipodomys ordii KU. Vol 1 No 23
Setzer, Henry W.
363 Gutenberg downloadsen2013Difficulty 66 (Academic)
Von Sonnen und Sonnenstäubchen : $b Kosmische Wanderungen
Bölsche, Wilhelm
363 Gutenberg downloadsde2025
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
362 Gutenberg downloadsen2023Difficulty 45 (College)
Leprosy : $b in its clinical & pathological aspects
Hansen, G. Armauer (Gerhard Armauer) & Looft, Carl
362 Gutenberg downloadsen2023Difficulty 64 (Academic)
Palm trees of the Amazon and their uses
Wallace, Alfred Russel
362 Gutenberg downloadsen2023Difficulty 62 (Academic)
Schenk's Theory: The Determination of Sex
Schenk, Samuel Leopold
362 Gutenberg downloadsen2014Difficulty 59 (Graduate)
The History of Esculent Fish
North, Roger
362 Gutenberg downloadsen2021Difficulty 47 (College)
A New Subspecies of the Black Myotis (Bat) from Eastern Mexico
Hall, E. Raymond (Eugene Raymond) & Alvarez, Ticul
361 Gutenberg downloadsen2008Difficulty 55 (Graduate)
Geographic Distribution and Taxonomy of the Chipmunks of Wyoming
White, John A.
361 Gutenberg downloadsen2010Difficulty 50 (College)
A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas
Eaton, Theodore H. (Theodore Hildreth) & Stewart, Peggy Lou
360 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Flowers and their friends
Morley, Margaret Warner
360 Gutenberg downloadsen2024Difficulty 39 (High School)
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
360 Gutenberg downloadsfr2010
The Genera of Phyllomedusine Frogs (Anura: Hylidae)
Duellman, William Edward
360 Gutenberg downloadsen2010Difficulty 74 (Expert)
The Christian Foundation, Or, Scientific and Religious Journal, Volume 1, Index, 1880
Various
359 Gutenberg downloadsen2009Difficulty 77 (Expert)
Fishes of Chautauqua, Cowley and Elk Counties, Kansas
Metcalf, Artie L.
358 Gutenberg downloadsen2010Difficulty 55 (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)
358 Gutenberg downloadsen2012Difficulty 60 (Graduate)
Observations on the Mississippi Kite in Southwestern Kansas
Fitch, Henry S. (Henry Sheldon)
358 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Parasiten der Honigbiene und die durch dieselben bedingten Krankheiten dieses Insects.
Assmuss, Eduard Philibert
358 Gutenberg downloadsde2006
Self-Organizing Systems, 1963
Unknown
358 Gutenberg downloadsen2021Difficulty 72 (Expert)
Summer Birds From the Yucatan Peninsula, Mexico
Klaas, Erwin E.
358 Gutenberg downloadsen2011Difficulty 52 (Graduate)
Zoological Illustrations, Second Series, Volume 1 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
358 Gutenberg downloadsen2013Difficulty 59 (Graduate)
A mechanical and critical enquiry into the nature of hermaphrodites
Parsons, James
357 Gutenberg downloadsen2023Difficulty 62 (Academic)
The fauna of the deep sea
Hickson, Sydney J. (Sydney John)
357 Gutenberg downloadsen2021Difficulty 63 (Academic)
The heathery; or, A monograph of the genus Erica. vol. 3
Andrews, Henry Cranke, active 1799-1828
357 Gutenberg downloadsen2023Difficulty 56 (Graduate)
The Ohio Journal of Science, Vol. XVI, No. 1, November 1915
Various
357 Gutenberg downloadsen2017Difficulty 50 (College)
A New Doglike Carnivore, Genus Cynarctus, From the Clarendonian, Pliocene, of Texas
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
356 Gutenberg downloadsen2009Difficulty 53 (Graduate)
Contagious Abortion of Cows
MacNeal, Ward J.
356 Gutenberg downloadsen2011Difficulty 66 (Academic)
Journal of Entomology and Zoology, Vol. 11, No. 2, June 1919
Various
356 Gutenberg downloadsen2010Difficulty 54 (Graduate)
On the phenomena of variation and geographical distribution as illustrated by the Papilionidæ of the Malayan region
Wallace, Alfred Russel
356 Gutenberg downloadsen2024Difficulty 66 (Academic)
Studies in Spermatogenesis (Part 1 of 2)
Stevens, N. M. (Nettie Maria)
356 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Synopsis of Some Genera of the Large Pyrenomycetes Camillea, Thamnomyces, Engleromyces
Lloyd, C. G. (Curtis Gates)
356 Gutenberg downloadsen2007Difficulty 52 (Graduate)
Westafrikanische Kautschuk-Expedition
Schlechter, Rudolf & Deutsche Kolonialgesellschaft. Kolonial-Wirtschaftliches Komitee
356 Gutenberg downloadsde2022
Cholera and the Water Supply in the South Districts of London in 1854
Snow, John
355 Gutenberg downloadsen2021Difficulty 71 (Expert)
Kyphosis and other Variations in Soft-shelled Turtles
Smith, Hobart M. (Hobart Muir)
355 Gutenberg downloadsen2010Difficulty 46 (College)
Observations on the Oleum Jecoris Aselli, or Cod-liver Oil Its nature, properties, mode of preparation, &c.
Savory, John
355 Gutenberg downloadsen2021Difficulty 70 (Academic)
Records of the Fossil Mammal Sinclairella, Family Apatemyidae, From the Chadronian and Orellan
Clemens, William A. (William Alvin)
355 Gutenberg downloadsen2009Difficulty 57 (Graduate)
The preparation & mounting of microscopic objects
Davies, Thomas
355 Gutenberg downloadsen2019Difficulty 53 (Graduate)
A New Genus of Pennsylvanian Fish (Crossopterygii, Coelacanthiformes) from Kansas
Echols, Joan
354 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Beautiful shells : $b Their nature, structure, and uses familiarly explained; with directions for collecting, cleaning, and arranging them in the cabinet; descriptions of the most remarkable species, and of the creatures which inhabit them; and explanations of the meanings of their scientific names, and of the terms used in conchology
Adams, H. G. (Henry Gardiner)
354 Gutenberg downloadsen2024Difficulty 66 (Academic)
The Kansas University Science Bulletin, Vol. I, No. 2, February, 1902
Various
354 Gutenberg downloadsen2017Difficulty 52 (Graduate)
The Salmon Fishery of Penobscot Bay and River in 1895-96
Smith, Hugh M. (Hugh McCormick)
354 Gutenberg downloadsen2005Difficulty 48 (College)
A New Bat (Myotis) From Mexico
Hall, E. Raymond (Eugene Raymond)
353 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Der Mensch der Zukunft
Bölsche, Wilhelm
353 Gutenberg downloadsde2018
Het Leven der Dieren: Deel 1, Hoofdstuk 04: De Roofdieren
Brehm, Alfred Edmund
353 Gutenberg downloadsnl2006
A New Subspecies of the Fruit-eating Bat, Sturnira ludovici, From Western Mexico
Jones, J. Knox & Phillips, Gary L.
352 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Bee-keeping for profit
Morley, W. S.
352 Gutenberg downloadsen2022Difficulty 53 (Graduate)
Foreign Butterflies
Duncan, James
352 Gutenberg downloadsen2018Difficulty 56 (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
352 Gutenberg downloadsen2025Difficulty 49 (College)
The Virtue and Use of Coffee With Regard to the Plague and Other Infectious Distempers
Bradley, Richard
352 Gutenberg downloadsen2019Difficulty 63 (Academic)
The works of Francis Maitland Balfour, Volume 4 (of 4) : $b Plates
Balfour, Francis M. (Francis Maitland)
352 Gutenberg downloadsen2014Difficulty 50 (College)
Uit de dierenwereld van het water Schetsen in woord en beeld van het lever der lagere diersoorten
Snijders, A. J. C. (Anthony J. C.)
352 Gutenberg downloadsnl2022
A Statement of Facts Tending to Establish an Estimate of the True Value and Present State of Vaccination
Blane, Gilbert, Sir
351 Gutenberg downloadsen2022Difficulty 67 (Academic)
De la télépathie: Étude sur la transmission de la pensée
Hureau, Émile
351 Gutenberg downloadsfr2006
Evolution and Adaptation
Morgan, Thomas Hunt
351 Gutenberg downloadsen2020Difficulty 62 (Academic)
La philosophie zoologique avant Darwin
Perrier, Edmond
351 Gutenberg downloadsfr2010
Lehrbuch der Toxikologie für Tierärzte
Fröhner, Eugen
351 Gutenberg downloadsde2022
Poisonous Snakes of Kansas
Clarke, Robert F. (Robert Francis)
351 Gutenberg downloadsen2019Difficulty 50 (College)
Scientific American Supplement, No. 648, June 2, 1888.
Various
351 Gutenberg downloadsen2011Difficulty 54 (Graduate)
The Myxomycetes of the Miami Valley, Ohio
Morgan, A. P. (Andrew Price)
351 Gutenberg downloadsen2009Difficulty 64 (Academic)
Vertebrates from the Barrier Island of Tamaulipas, México
Selander, Robert K. & Johnston, Richard F. & Raun, Gerald G. & Wilks, B. J.
351 Gutenberg downloadsen2011Difficulty 54 (Graduate)
Zoological Illustrations, Volume 3 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
351 Gutenberg downloadsen2012Difficulty 60 (Graduate)
A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, México
Duellman, William Edward
350 Gutenberg downloadsen2011Difficulty 65 (Academic)
Eugenics as a Factor in the Prevention of Mental Disease
Pollock, Horatio M. (Horatio Milo)
350 Gutenberg downloadsen2011Difficulty 65 (Academic)
Report on the Migration of Birds in the Spring and Autumn of 1886. Eighth Report (Vol. II, No. 3.)
Harvie-Brown, J. A. (John Alexander) & Barrington, Richard Manliffe & Clarke, William Eagle & Cordeaux, John & More, Alexander Goodman
350 Gutenberg downloadsen2021Difficulty 43 (College)
The Methods and Scope of Genetics An inaugural lecture delivered 23 October 1908
Bateson, William
350 Gutenberg downloadsen2016Difficulty 60 (Graduate)
A Monograph of the Trilobites of North America: with Coloured Models of the Species
Green, Jacob
349 Gutenberg downloadsen2021Difficulty 63 (Academic)
A New Extinct Emydid Turtle from the Lower Pliocene of Oklahoma
Galbreath, Edwin C. (Edwin Carter)
349 Gutenberg downloadsen2010Difficulty 59 (Graduate)
The genetic and the operative evidence relating to secondary sexual characters
Morgan, Thomas Hunt
349 Gutenberg downloadsen2018Difficulty 47 (College)
Additions to the List of the Birds of Louisiana
Lowery, George H., Jr.
348 Gutenberg downloadsen2010Difficulty 61 (Academic)
La vie des termites
Maeterlinck, Maurice
348 Gutenberg downloadsfr2024
Comments on the Taxonomy and Geographic Distribution of Some North American Marsupials, Insectivores and Carnivores
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
347 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Fishes of the Big Blue River Basin, Kansas
Minckley, W. L.
347 Gutenberg downloadsen2011Difficulty 47 (College)
Mammals taken Along the Alaska Highway
Baker, Rollin H. (Rollin Harold)
347 Gutenberg downloadsen2010Difficulty 47 (College)
Memorias sobre a influencia dos descobrimentos portuguezes no conhecimento das plantas I. - Memoria sobre a Malagueta
Ficalho, Francisco Manuel de Melo, Conde de
347 Gutenberg downloadspt2009
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
347 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Reis door Noord Amerika : $b Gedaan door den Heer Pieter Kalm
Kalm, Pehr
347 Gutenberg downloadsnl2023
The American Bee Journal, Vol. VI., Number 5, November 1870
Various
347 Gutenberg downloadsen2018Difficulty 53 (Graduate)
The botanist's repository for new and rare plants; vol. 08 [of 10]
Andrews, Henry Cranke, active 1799-1828
347 Gutenberg downloadsen2024Difficulty 58 (Graduate)
The Periodical Cicada, "the 17-year Locust"
United States. Department of Agriculture
347 Gutenberg downloadsen2019Difficulty 51 (Graduate)
Coyotes in Their Economic Relations
Lantz, David E. (David Ernest)
346 Gutenberg downloadsen2014Difficulty 54 (Graduate)
Pipistrellus cinnamomeus Miller 1902 Referred to the Genus Myotis
Hall, E. Raymond (Eugene Raymond) & Dalquest, Walter Woelber
346 Gutenberg downloadsen2010Difficulty 55 (Graduate)
The Bedbug [1934]
Marlatt, C. L.
346 Gutenberg downloadsen2020Difficulty 62 (Academic)
The Popular Science Monthly, August, 1900 Vol. 57, May, 1900 to October, 1900
Various
346 Gutenberg downloadsen2014Difficulty 68 (Academic)
Pecan Diseases and Pests and Their Control
Rosburg, David W. & King, D. R.
345 Gutenberg downloadsen2021Difficulty 64 (Academic)
The modes of origin of lowest organisms including a discussion of the experiments of M. Pasteur
Bastian, H. Charlton
345 Gutenberg downloadsen2015Difficulty 71 (Expert)
The heathery; or, A monograph of the genus Erica. vol. 1
Andrews, Henry Cranke, active 1799-1828
344 Gutenberg downloadsen2022Difficulty 52 (Graduate)
Journal of Entomology and Zoology, Vol. 06, No. 4, December 1914
Various
343 Gutenberg downloadsen2015Difficulty 53 (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
343 Gutenberg downloadsen2021Difficulty 41 (College)
The horse's mouth, showing the age by the teeth
Mayhew, Edward
343 Gutenberg downloadsen2014Difficulty 55 (Graduate)
Description of a New Softshell Turtle from the Southeastern United States
Webb, Robert G. (Robert Gravem)
342 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Epidemics Examined and Explained: or, Living Germs Proved by Analogy to be a Source of Disease
Grove, John
342 Gutenberg downloadsen2010Difficulty 65 (Academic)
Five Natural Hybrid Combinations in Minnows (Cyprinidae)
Cross, Frank B. (Frank Bernard) & Minckley, W. L.
342 Gutenberg downloadsen2011Difficulty 56 (Graduate)
Morphological Variation in a Population of the Snake, Tantilla gracilis Baird and Girard
Hardy, Laurence M. & Cole, Charles J.
342 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Unsere Haustiere vom Standpunkte ihrer wilden Verwandten
Zell, Th. (Theodor)
342 Gutenberg downloadsde2018
Comments on the Taxonomy and Geographic Distribution of Some North American Rodents
Hall, E. Raymond (Eugene Raymond) & Kelson, Keith R.
341 Gutenberg downloadsen2010Difficulty 56 (Graduate)
Mammals Obtained by Dr. Curt von Wedel from the Barrier Beach of Tamaulipas, Mexico
Hall, E. Raymond (Eugene Raymond)
341 Gutenberg downloadsen2009Difficulty 53 (Graduate)
New West Indian Spiders Bulletin of the AMNH, Vol. XXXIII, Art. XLI, pp. 639-642
Banks, Nathan
341 Gutenberg downloadsen2010Difficulty 47 (College)
Notes on Veterinary Anatomy
Korinek, Charles James
341 Gutenberg downloadsen2019Difficulty 53 (Graduate)
Plague Its Cause and the Manner of its Extension, Its Menace, Its Control and Suppression, Its Diagnosis and Treatment
Jackson, Thomas Wright
341 Gutenberg downloadsen2013Difficulty 68 (Academic)
The Philosophy of Evolution Together With a Preliminary Essay on The Metaphysical Basis of Science
Carpenter, Stephen H. (Stephen Haskins)
341 Gutenberg downloadsen2009Difficulty 64 (Academic)
An account of the manner of inoculating for the small pox in the East Indies With some observations on the practice and mode of treating that disease in those parts
Holwell, J. Z. (John Zephaniah)
340 Gutenberg downloadsen2016Difficulty 88 (Specialist)
Catalogue of the dipterous insects collected at Singapore and Malacca
Wallace, Alfred Russel
340 Gutenberg downloadsen2023Difficulty 56 (Graduate)
Emanuel Swedenborg's Investigations in Natural Science and the Basis for His Statements Concerning the Functions of the Brain
Ramström, Martin
340 Gutenberg downloadsen2020Difficulty 71 (Expert)
Palæontological Report of the Princeton Scientific Expedition of 1877
Osborn, Henry Fairfield & Scott, William Berryman & Speir, Francis
340 Gutenberg downloadsen2021Difficulty 56 (Graduate)
Sweet-Clover Seed
Coe, H. S. & Martin, John N. (John Nathan)
340 Gutenberg downloadsen2020Difficulty 60 (Graduate)
The Domestic Cat
Stables, Gordon
340 Gutenberg downloadsen2011Difficulty 51 (Graduate)
Zwischen Pol und Äquator: Tiergeographische Lebensbilder
Floericke, Kurt
340 Gutenberg downloadsde2022
A New Hylid Frog from Eastern Mexico. University of Kansas Publication, Vol 1, No 15
Taylor, Edward Harrison
339 Gutenberg downloadsen2010Difficulty 62 (Academic)
Cranial Osteology of the Hylid Frog, Smilisca baudini
Trueb, Linda
339 Gutenberg downloadsen2010Difficulty 61 (Academic)
George Washington Carver National Monument Junior Ranger Activity Book: The Scientist
United States. National Park Service
339 Gutenberg downloadsen2020Difficulty 49 (College)
Phrenological Development of Robert Burns From a Cast of His Skull Moulded at Dumfries, the 31st Day of March 1834
Combe, George
339 Gutenberg downloadsen2009Difficulty 58 (Graduate)
The Book of Shells Containing the Classes Mollusca, Conchifera, Cirrhipeda, Annulata, and Crustacea
Society for Promoting Christian Knowledge (Great Britain). Committee of General Literature and Education
339 Gutenberg downloadsen2019Difficulty 64 (Academic)
Alpine flora of the Canadian Rocky Mountains
Brown, Stewardson
338 Gutenberg downloadsen2025Difficulty 60 (Graduate)
Het Leven der Dieren: Deel 2, Hoofdstuk 01: De Boomvogels.
Brehm, Alfred Edmund
338 Gutenberg downloadsnl2009
Les grands froids
Bouant, Emile
338 Gutenberg downloadsfr2013
Notes on Diseases of Cattle: Cause, Symptoms and Treatment
Korinek, Charles James
338 Gutenberg downloadsen2019Difficulty 55 (Graduate)
Notes on Diseases of Swine, Sheep, Poultry and the Dog Cause, Symptoms and Treatments
Korinek, Charles James
338 Gutenberg downloadsen2019Difficulty 55 (Graduate)
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.
338 Gutenberg downloadsen2010Difficulty 55 (Graduate)
Phrenology Examined
Flourens, P. (Pierre)
338 Gutenberg downloadsen2021Difficulty 59 (Graduate)
Supplement to Harvesting Ants and Trap-Door Spiders
Moggridge, John Traherne & Pickard-Cambridge, Octavius
338 Gutenberg downloadsen2021Difficulty 59 (Graduate)
Taxonomic Notes on Mexican Bats of the Genus Rhogeëssa
Hall, E. Raymond (Eugene Raymond)
338 Gutenberg downloadsen2010Difficulty 50 (College)
The Italian Alp-bee; or, The gold mine of husbandry short and practical instructions to breed genuine prolific Italian queens; to multiply them by hundreds in a few months and how to change German hives into Italian
Hermann, H. C. (Heinrich C.)
338 Gutenberg downloadsen2023Difficulty 51 (Graduate)
An Annotated Check List of the Mammals of Michoacán, México
Hall, E. Raymond (Eugene Raymond) & Villa Ramírez, Bernardo
337 Gutenberg downloadsen2012Difficulty 55 (Graduate)
Home Range and Movements of the Eastern Cottontail in Kansas
Janes, Donald W.
337 Gutenberg downloadsen2009Difficulty 55 (Graduate)
Natural History of the Salamander, Aneides hardii
Johnston, Richard F. & Schad, G. A.
337 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Poultry diseases Causes, symptoms and treatment, with notes on post-mortem examinations
Wortley, E. J. (E. Jocelyn)
337 Gutenberg downloadsen2022Difficulty 57 (Graduate)
Het Leven der Dieren: Deel 1, Hoofdstuk 11: De Evenvingerigen
Brehm, Alfred Edmund
336 Gutenberg downloadsnl2007
Proceedings of the California Academy of Sciences, Series 3, Volume 4 (Zoology)
Various
336 Gutenberg downloadsen2017Difficulty 70 (Academic)
The American Bee Journal, Volume VI, Number 3, September 1870
Various
336 Gutenberg downloadsen2018Difficulty 56 (Graduate)
Inferences from Haunted Houses and Haunted Men
Harris, J. W. (John William)
335 Gutenberg downloadsen2004Difficulty 50 (College)
Report on the Migration of Birds in the Autumn of 1879. [First Report]
Harvie-Brown, J. A. (John Alexander) & Cordeaux, John
335 Gutenberg downloadsen2021Difficulty 40 (High School)
The Ancestry of Modern Amphibia: A Review of the Evidence
Eaton, Theodore H. (Theodore Hildreth)
335 Gutenberg downloadsen2011Difficulty 69 (Academic)
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
334 Gutenberg downloadsen2014Difficulty 50 (College)
A synopsis of the palms of Puerto Rico
Cook, O. F. (Orator Fuller)
334 Gutenberg downloadsen2023Difficulty 63 (Academic)
Bacteria in Daily Life
Frankland, Grace C.
334 Gutenberg downloadsen2013Difficulty 81 (Specialist)
Comments on the Taxonomy and Geographic Distribution of North American Microtines
Hall, E. Raymond (Eugene Raymond) & Cockrum, E. Lendell
334 Gutenberg downloadsen2009Difficulty 62 (Academic)
Lajien synty: Luonnollisen valinnan kautta
Darwin, Charles
334 Gutenberg downloadsfi2016
Additional Records and Extensions of Known Ranges of Mammals from Utah
Durrant, Stephen David & Hansen, Richard M. & Lee, M. Raymond
333 Gutenberg downloadsen2010Difficulty 57 (Graduate)
The botanist's repository for new and rare plants; vol. 06 [of 10]
Andrews, Henry Cranke, active 1799-1828
333 Gutenberg downloadsen2024Difficulty 63 (Academic)
A Synopsis of Neotropical Hylid Frogs, Genus Osteocephalus
Trueb, Linda & Duellman, William Edward
332 Gutenberg downloadsen2011Difficulty 67 (Academic)
Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, III. Band Das Emporblühen der modernen Naturwissenschaften bis zur Entdeckung des Energieprinzipes
Dannemann, Friedrich
332 Gutenberg downloadsde2018
From an Easy Chair
Lankester, E. Ray (Edwin Ray), Sir
332 Gutenberg downloadsen2020Difficulty 50 (College)
Genera and Subgenera of Chipmunks
White, John A.
332 Gutenberg downloadsen2009Difficulty 61 (Academic)
Links With the Past in the Plant World
Seward, A. C. (Albert Charles)
332 Gutenberg downloadsen2020Difficulty 65 (Academic)
The Philosophy of Health; Volume 2 (of 2) or, an exposition of the physical and mental constitution of man
Smith, Southwood
332 Gutenberg downloadsen2019Difficulty 72 (Expert)
A Treatise of Buggs
Southall, John
331 Gutenberg downloadsen2015Difficulty 56 (Graduate)
Darwinism and Race Progress
Haycraft, John Berry
331 Gutenberg downloadsen2014Difficulty 71 (Expert)
Saunders' Books on Pathology, Physiology Histology, Embryology and Bacteriology
W.B. Saunders Company
331 Gutenberg downloadsen2017Difficulty 61 (Academic)
Selected Records of Reptiles and Amphibians from Kansas
Breukelman, John & Smith, Hobart M. (Hobart Muir)
331 Gutenberg downloadsen2010Difficulty 47 (College)
Systematic Status of a South American Frog, Allophryne ruthveni Gaige
Lynch, John D. & Freeman, Howard L.
331 Gutenberg downloadsen2010Difficulty 63 (Academic)
The heathery; or, A monograph of the genus Erica. vol. 6
Andrews, Henry Cranke, active 1799-1828
331 Gutenberg downloadsen2023Difficulty 58 (Graduate)
The Ohio Naturalist, vol. II, no. 2, December, 1901
Ohio State University. Biological Club
331 Gutenberg downloadsen2023Difficulty 64 (Academic)
Thoracic and Coracoid Arteries In Two Families of Birds, Columbidae and Hirundinidae
Jenkinson, Marion Anne
331 Gutenberg downloadsen2010Difficulty 64 (Academic)
Journal of Entomology and Zoology, Vol. 09, No. 3, September 1917
Various
330 Gutenberg downloadsen2015Difficulty 56 (Graduate)
A New Name for the Mexican Red Bat
Hall, E. Raymond (Eugene Raymond)
329 Gutenberg downloadsen2007Difficulty 55 (Graduate)
Aus dem Leben der Insekten
Buckley, Arabella B. (Arabella Burton)
329 Gutenberg downloadsde2022
Birds Found on the Arctic Slope of Northern Alaska
Bee, James W.
329 Gutenberg downloadsen2010Difficulty 42 (College)
Darwin, and After Darwin, Volume 2 of 3 Post-Darwinian Questions: Heredity and Utility
Romanes, George John
329 Gutenberg downloadsen2011Difficulty 64 (Academic)
Pleistocene Bats from San Josecito Cave, Nuevo Leon, Mexico
Jones, J. Knox
329 Gutenberg downloadsen2009Difficulty 55 (Graduate)
Powder-Post Beetles in Buildings: What to Do About Them
St. George, R. A. (Raymond Alexander) & McIntyre, T.
329 Gutenberg downloadsen2019Difficulty 50 (College)
Zoological Illustrations, Second Series, Volume 3 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
329 Gutenberg downloadsen2013Difficulty 61 (Academic)
The Nautilus. Vol. XXXI, No. 2, October 1917 A Quarterly Journal Devoted to the Interests of Conchologists
Various
328 Gutenberg downloadsen2019Difficulty 52 (Graduate)
De Harmonie van het Dierlijke Leven: De Openbaring van Wetten
Donders, F. C. (Franciscus Cornelis)
327 Gutenberg downloadsnl2005
Het Leven der Dieren: Deel 1, Hoofdstuk 14: Buideldieren; Hoofdstuk 15: Kloakdieren
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327 Gutenberg downloadsnl2007
Illustrated Index of British Shells Containing figures of all the recent species
Sowerby, G. B. (George Brettingham)
327 Gutenberg downloadsen2013Difficulty 53 (Graduate)
Methods of Destroying Rats
Lantz, David E. (David Ernest)
327 Gutenberg downloadsen2010Difficulty 55 (Graduate)
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
327 Gutenberg downloadsen2021Difficulty 44 (College)
The Deseado Formation of Patagonia
Loomis, Frederic Brewster
327 Gutenberg downloadsen2024Difficulty 61 (Academic)
The Hunterian lectures on colour-vision and colour-blindness
Edridge-Green, F. W. (Frederick William)
327 Gutenberg downloadsen2025Difficulty 56 (Graduate)
A Population Study of the Prairie Vole (Microtus ochrogaster) in Northeastern Kansas
Martin, Edwin Perry
326 Gutenberg downloadsen2012Difficulty 61 (Academic)
Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado
Douglas, Charles L.
326 Gutenberg downloadsen2012Difficulty 63 (Academic)
Jaw Musculature of the Mourning and White-winged Doves
Merz, Robert L.
326 Gutenberg downloadsen2010Difficulty 58 (Graduate)
Les Phénomènes Psychiques Occultes: État Actuel de la Question
Coste, Albert
326 Gutenberg downloadsfr2013
Notizie del pubblico giardino de' semplici di Padova compilate intorno l'anno 1771
Marsili, Giovanni
326 Gutenberg downloadsit2005
The Ohio naturalist, Vol. 1, No. 8, June 1901
Ohio State University. Biological Club
326 Gutenberg downloadsen2022Difficulty 51 (Graduate)
An inaugural dissertation on pulmonary consumption
Delafield, Edward
325 Gutenberg downloadsen2022Difficulty 63 (Academic)
Mammals of the Grand Mesa, Colorado
Anderson, Sydney
325 Gutenberg downloadsen2010Difficulty 51 (Graduate)
The Baculum in the Chipmunks of Western North America
White, John A.
325 Gutenberg downloadsen2010Difficulty 46 (College)
The Kansas University Science Bulletin (Vol. I, No. 1)
Various
325 Gutenberg downloadsen2017Difficulty 50 (College)
The run
Hay, John
325 Gutenberg downloadsen2025Difficulty 48 (College)
A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope
Lynch, John D.
324 Gutenberg downloadsen2011Difficulty 64 (Academic)
Den Waaragtigen Omloop des Bloeds
Leeuwenhoek, Antoni van
324 Gutenberg downloadsnl2006
Descriptions of New Hylid Frogs From Mexico and Central America
Duellman, William Edward
324 Gutenberg downloadsen2010Difficulty 64 (Academic)
The Florist and Horticultural Journal, Vol. II. No. 7, July, 1853 A Monthly Magazine of Horticulture, Agriculture, Botany, Agricultural Chemistry, Entomology, &c.
Various
324 Gutenberg downloadsen2018Difficulty 55 (Graduate)
The Underworld of Oregon Caves National Monument
Contor, Roger J.
324 Gutenberg downloadsen2019Difficulty 56 (Graduate)
Het Leven der Dieren: Deel 1, Hoofdstuk 07: De Knaagdieren
Brehm, Alfred Edmund
323 Gutenberg downloadsnl2007
Some possible bearings of genetics on pathology
Morgan, Thomas Hunt
323 Gutenberg downloadsen2023Difficulty 57 (Graduate)
Zoological Illustrations, Volume 2 or, Original Figures and Descriptions of New, Rare, or Interesting Animals
Swainson, William
323 Gutenberg downloadsen2012Difficulty 62 (Academic)
A study of some factors influencing fertility and sterility in the bull
Gilman, Herbert Lester
322 Gutenberg downloadsen2024Difficulty 67 (Academic)
Beginselen der dierkunde
Ritzema Bos, J. (Jan)
322 Gutenberg downloadsnl2010
Fishes of the Wakarusa River in Kansas
Deacon, James E. & Metcalf, Artie L.
321 Gutenberg downloadsen2010Difficulty 45 (College)
On The Affinities of Leptarctus primus of Leidy American Museum of Natural History, Vol. VI, Article VIII, pp. 229-331.
Wortman, Jacob Lawson
321 Gutenberg downloadsen2008Difficulty 54 (Graduate)
The Bedbug [1916]
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321 Gutenberg downloadsen2020Difficulty 61 (Academic)
The Postnatal Development of Two Broods of Great Horned Owls (Bubo virginianus)
Hoffmeister, Donald Frederick & Setzer, Henry W.
321 Gutenberg downloadsen2011Difficulty 51 (Graduate)
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320 Gutenberg downloadsde2016
Dissection of the Platana and the Frog
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320 Gutenberg downloadsen2015Difficulty 51 (Graduate)
The botanist's repository for new and rare plants; vol. 05 [of 10]
Andrews, Henry Cranke, active 1799-1828
320 Gutenberg downloadsen2024Difficulty 55 (Graduate)
The Preparation of Bees for Outdoor Wintering
Phillips, Everett Franklin & Demuth, Geo. S. (George S.)
320 Gutenberg downloadsen2019Difficulty 53 (Graduate)
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
320 Gutenberg downloadsen2015Difficulty 68 (Academic)
A study of mushrooms and mushroom spawn
Jacob, Edward Henry
319 Gutenberg downloadsen2023Difficulty 50 (College)
An Essay on the Effects of Opium. Considered as a Poison
Awsiter, John
319 Gutenberg downloadsen2016Difficulty 75 (Expert)
De Wereld vóór de schepping van den mensch
Flammarion, Camille
319 Gutenberg downloadsnl2006
I funghi mangerecci e velenosi dell'Europa media con speciale riguardo a quelli che crescono nel Trentino - II edizione riveduta ed aumentata
Bresadola, Giacomo
319 Gutenberg downloadsit2013
Subspeciation in Pocket Gophers of Kansas, [KU. Vol. 1 No. 11]
Villa Ramírez, Bernardo & Hall, E. Raymond (Eugene Raymond)
319 Gutenberg downloadsen2011Difficulty 58 (Graduate)
The flowering plants of South Africa; vol. 2
Unknown
319 Gutenberg downloadsen2021Difficulty 51 (Graduate)
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Huxley, Thomas Henry
319 Gutenberg downloadsde2010
De afstamming van den mensch en de seksueele teeltkeus, deel 2 (van 2)
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318 Gutenberg downloadsnl2024
Description of a New Vespertilionine Bat from Yucatan Author's Edition, extracted from Bulletin of the American Museum of Natural History, Vol. IX, September 28, 1897
Allen, J. A. (Joel Asaph)
318 Gutenberg downloadsen2008Difficulty 53 (Graduate)
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Lucanus, Friedrich von
318 Gutenberg downloadsde2024
Le Tour du Monde; Voyage d'un naturaliste. Journal des voyages et des voyageurs; 2. sem. 1860
Various
318 Gutenberg downloadsfr2008
Rust, Smut, Mildew, & Mould: An Introduction to the Study of Microscopic Fungi
Cooke, M. C. (Mordecai Cubitt)
318 Gutenberg downloadsen2020Difficulty 61 (Academic)
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318 Gutenberg downloadsen2019Difficulty 69 (Academic)
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Johnstone, James
318 Gutenberg downloadsen2020Difficulty 65 (Academic)
Ecology of the Opossum on a Natural Area in Northeastern Kansas
Fitch, Henry S. (Henry Sheldon) & Sandidge, Lewis L.
317 Gutenberg downloadsen2011Difficulty 62 (Academic)
Profitable poultry : $b Their management in health and disease
Tegetmeier, W. B. (William Bernhard)
317 Gutenberg downloadsen2024Difficulty 65 (Academic)
Some Common Birds Useful to the Farmer (1926 edition)
Beal, F. E. L. (Foster Ellenborough Lascelles)
317 Gutenberg downloadsen2020Difficulty 55 (Graduate)
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Anderson, Sydney
317 Gutenberg downloadsen2011Difficulty 64 (Academic)
De afstamming van den mensch Naar voordrachten in populair-wetenschappelijken vorm bewerkt
Boeke, Jan
316 Gutenberg downloadsnl2017
On the Variation of Species, with Especial Reference to the Insecta Followed by an Inquiry into the Nature of Genera
Wollaston, Thomas Vernon
316 Gutenberg downloadsen2012Difficulty 78 (Expert)
Observations on the Terataspis grandis, Hall, the largest known trilobite
Clarke, John Mason
315 Gutenberg downloadsen2022Difficulty 60 (Graduate)
Species Plantarum, Sections XI-XIII
Linné, Carl von
315 Gutenberg downloadsla2010
The Botanical Magazine, Vol. 09 Or, Flower-Garden Displayed
Curtis, William
315 Gutenberg downloadsen2011Difficulty 58 (Graduate)
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315 Gutenberg downloadsen2010Difficulty 60 (Graduate)
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Andrews, Henry Cranke, active 1799-1828
314 Gutenberg downloadsen2023Difficulty 60 (Graduate)
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Jones, J. Knox
314 Gutenberg downloadsen2010Difficulty 62 (Academic)
Geographic Variation in Red-backed Mice (Genus Clethrionomys) of the Southern Rocky Mountain Region
Cockrum, E. Lendell & Fitch, Kenneth Leonard
314 Gutenberg downloadsen2010Difficulty 53 (Graduate)
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Gosse, Philip Henry
314 Gutenberg downloadsen2024Difficulty 48 (College)
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314 Gutenberg downloadsde2022
Reise in die Aequinoctial-Gegenden des neuen Continents. Band 4.
Humboldt, Alexander von
314 Gutenberg downloadsde2012
Researches on the Visual Organs of the Trilobites
Lindström, Gustaf
313 Gutenberg downloadsen2022Difficulty 54 (Graduate)
The botanist's repository for new and rare plants; vol. 07 [of 10]
Andrews, Henry Cranke, active 1799-1828
313 Gutenberg downloadsen2024Difficulty 57 (Graduate)
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313 Gutenberg downloadsen2010Difficulty 64 (Academic)
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Blumenbach, Johann Friedrich
313 Gutenberg downloadsde2020
Bees from British Guiana Bulletin of the AMNH, Vol. XXXVIII, Art. XX, pp. 685-690
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312 Gutenberg downloadsen2010Difficulty 55 (Graduate)
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312 Gutenberg downloadsen2010Difficulty 61 (Academic)
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León, Juan R.
312 Gutenberg downloadsen2010Difficulty 60 (Graduate)
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311 Gutenberg downloadsde2016
Het Leven der Dieren: Deel 1, Hoofdstuk 08: De Tandeloozen; Hoofdstuk 09: De Slurfdieren; Hoofdstuk 10: De Onevenvingerigen
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311 Gutenberg downloadsnl2007
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Bölsche, Wilhelm
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Franze, Paul Christian
311 Gutenberg downloadsde2013
Sir William Flower
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311 Gutenberg downloadsen2025Difficulty 72 (Expert)
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)
310 Gutenberg downloadsen2018Difficulty 58 (Graduate)
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Gould, John
310 Gutenberg downloadsen2019Difficulty 64 (Academic)
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309 Gutenberg downloadsen2019Difficulty 54 (Graduate)
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309 Gutenberg downloadsen2023Difficulty 60 (Graduate)
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Anonymous
309 Gutenberg downloadspt2006
The Anatomy of Vegetables Begun With a General Account of Vegetation founded thereon
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309 Gutenberg downloadsen2018Difficulty 48 (College)
Two New Pelycosaurs from the Lower Permian of Oklahoma
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309 Gutenberg downloadsen2009Difficulty 59 (Graduate)
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308 Gutenberg downloadsen2025Difficulty 63 (Academic)
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308 Gutenberg downloadsen2010Difficulty 62 (Academic)
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
Laing, S. (Samuel)
308 Gutenberg downloadsen2006Difficulty 66 (Academic)
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Abney, William de Wiveleslie, Sir
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Epidemic Respiratory Disease The pneumonias and other infections of the repiratory tract accompanying influenza and measles
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308 Gutenberg downloadsen2020Difficulty 67 (Academic)
Geographic Variation in the North American Cyprinid Fish, Hybopsis gracilis
Olund, Leonard J. & Cross, Frank B. (Frank Bernard)
308 Gutenberg downloadsen2011Difficulty 57 (Graduate)
Notes on the Mammals of Gogebic and Ontonagon Counties, Michigan, 1920 Occasional Papers of the Museum of Zoology, Number 109
Dice, Lee R. (Lee Raymond) & Sherman, Harley Bakwel
308 Gutenberg downloadsen2011Difficulty 54 (Graduate)
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307 Gutenberg downloadsen2009Difficulty 58 (Graduate)
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307 Gutenberg downloadsen2010Difficulty 53 (Graduate)
Seventeen Species of Bats Recorded from Barro Colorado Island, Panama Canal Zone
Hall, E. Raymond (Eugene Raymond) & Jackson, William B.
307 Gutenberg downloadsen2009Difficulty 49 (College)
The bedbug : $b Its relation to public health, its habits and life history, and methods of control
United States. Public Health Service
307 Gutenberg downloadsen2023Difficulty 60 (Graduate)
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Duellman, William Edward & Berg, Barbara
307 Gutenberg downloadsen2024Difficulty 56 (Graduate)
A Defence of the Inquiry into Mesmerism & Phrenology chiefly in relation to recent events in Lynn
Armes, William
306 Gutenberg downloadsen2017Difficulty 66 (Academic)
A New Pocket Mouse (Genus Perognathus) from Kansas
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306 Gutenberg downloadsen2010Difficulty 51 (Graduate)
An Estimate of the True Value of Vaccination as a Security Against Small Pox
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306 Gutenberg downloadsen2015Difficulty 70 (Academic)
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306 Gutenberg downloadsnl2009
Humboldt From 'The Gods and Other Lectures'
Ingersoll, Robert Green
306 Gutenberg downloadsen2011Difficulty 62 (Academic)
Noteworthy Mammals from Sinaloa, Mexico
Jones, J. Knox & Alvarez, Ticul & Lee, M. Raymond
306 Gutenberg downloadsen2010Difficulty 52 (Graduate)
The O. S. U. Naturalist, Vol. 1, No. 2, December, 1900
Ohio State University. Biological Club
306 Gutenberg downloadsen2023Difficulty 52 (Graduate)
An Attempt to Investigate the Seat of Animal Life
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305 Gutenberg downloadsen2021Difficulty 71 (Expert)
Das Mikroskop und seine Anwendung Ein Leitfaden bei mikroskopischen Untersuchungen
Hager, Hermann
305 Gutenberg downloadsde2015
El Campesino Puertorriqueño Sus Condiciones Físicas, Intelectuales y Morales, Causas que la Determinan y Medios Para Mejorarlas
Valle Atiles, Francisco del
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Handboek voor den kaasmaker in Nederland
Hollman, Pierre Jean
305 Gutenberg downloadsnl2010
Het Leven der Dieren: Deel 3.7, De Weekdieren
Brehm, Alfred Edmund
305 Gutenberg downloadsnl2020
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305 Gutenberg downloadsen2019Difficulty 56 (Graduate)
Mammals Collected by Dr. W. L. Abbott on the Natuna Islands Proceedings of the Washington Academy of Sciences, Vol. III, pp. 111-138
Miller, Gerrit S. (Gerrit Smith)
305 Gutenberg downloadsen2014Difficulty 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)
305 Gutenberg downloadsfr2024
Sertum Anglicum, seu, Plantae Rariores quae in Hortis Juxta Londinum Imprimis in Horto Regio Kewensi excoluntur, ab anno 1786 ad annum 1787 observata
L'Héritier de Brutelle, Charles Louis
305 Gutenberg downloadsla2012
Studies in Spermatogenesis (Part 2 of 2)
Stevens, N. M. (Nettie Maria)
305 Gutenberg downloadsen2010Difficulty 58 (Graduate)
The Science of Animal Locomotion (Zoopraxography) An Electro-Photographic Investigation of Consecutive Phases of Animal Movements
Muybridge, Eadweard
305 Gutenberg downloadsen2012Difficulty 65 (Academic)
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Arvey, M. Dale (Martin Dale)
304 Gutenberg downloadsen2011Difficulty 55 (Graduate)
Fauna der Nassauischen Mollusken
Kobelt, Wilhelm
304 Gutenberg downloadsde2015
The Tadpoles of Bufo cognatus Say
Smith, Hobart M. (Hobart Muir)
304 Gutenberg downloadsen2010Difficulty 54 (Graduate)
Aus den Tiefen des Weltmeeres Schilderungen von der deutschen Tiefsee-Expedition
Chun, Carl
303 Gutenberg downloadsde2014
Descripção de algumas especies novas ou pouco conhecidas de crustaceos e arachnidios de Portugal e possessões portuguezas do ultramar
Capello, Felix Antonio de Brito
303 Gutenberg downloadsfr2010
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
303 Gutenberg downloadsen2014Difficulty 66 (Academic)
Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado
Anderson, Sydney
303 Gutenberg downloadsen2010Difficulty 50 (College)
The O. S. U. Naturalist, Vol. 1, No. 1, November, 1900
Ohio State University. Biological Club
303 Gutenberg downloadsen2017Difficulty 56 (Graduate)
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Robertson, Douglas Argyll
302 Gutenberg downloadsen2023Difficulty 50 (College)
Geographic Variation in the Harvest Mouse, Reithrodontomys megalotis, On the Central Great Plains And in Adjacent Regions
Jones, J. Knox & Mursaloglu, B.
302 Gutenberg downloadsen2009Difficulty 56 (Graduate)
La flore utile du bassin de la Gambie
Rançon, A. (André)
302 Gutenberg downloadsfr2024
Records of Harvest Mice, Reithrodontomys, from Central America, with Description of a New Subspecies from Nicaragua
Anderson, Sydney & Jones, J. Knox
302 Gutenberg downloadsen2010Difficulty 55 (Graduate)
A Letter on Suspended Animation containing experiments shewing that it may be safely employed during operations on animals
Hickman, Henry Hill
301 Gutenberg downloadsen2018Difficulty 77 (Expert)
Taxonomy of the Chipmunks, Eutamias quadrivittatus and Eutamias umbrinus
White, John A.
301 Gutenberg downloadsen2010Difficulty 54 (Graduate)
The Protection of Fresh-Water Mussels
Coker, R. E. (Robert Ervin)
301 Gutenberg downloadsen2013Difficulty 65 (Academic)
A New Pocket Gopher (Genus Thomomys) From Wyoming and Colorado
Hall, E. Raymond (Eugene Raymond)
300 Gutenberg downloadsen2010Difficulty 51 (Graduate)
Account of the Skeleton of the Mammoth A non-descript carnivorous animal of immense size, found in America
Peale, Rembrandt
298 Gutenberg downloadsen2015Difficulty 66 (Academic)
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Young, Stanley Paul
298 Gutenberg downloadsen2019Difficulty 64 (Academic)
Études sur la flore du Sénégal
Vallot, Joseph
298 Gutenberg downloadsfr2024
Der Unterkiefer des Homo Heidelbergensis: Aus den Sanden von Mauer bei Heidelberg
Schoetensack, Otto
297 Gutenberg downloadsde2011
Memoria sobre a cultura da Urumbeba e sobre criação da Cochonilha
Thiéry de Menonville, Nicolas-Joseph & Berthollet, Claude-Louis & Velloso, José Mariano da Conceição
297 Gutenberg downloadspt2012
A New Species of Heteromyid Rodent from the Middle Oligocene of Northeast Colorado with Remarks on the Skull
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296 Gutenberg downloadsen2010Difficulty 57 (Graduate)
Pliocene and Pleistocene Records of Fossil Turtles from Western Kansas and Oklahoma University of Kansas Publications Museum of Natural History Volume 1
Galbreath, Edwin C. (Edwin Carter)
296 Gutenberg downloadsen2010Difficulty 60 (Graduate)
Two New Pocket Gophers from Wyoming and Colorado
Hall, E. Raymond (Eugene Raymond) & Montague, H. Gordon
296 Gutenberg downloadsen2009Difficulty 51 (Graduate)
Bird studies with a camera : $b with introductory chapters on the outfit and methods of the bird photographer
Chapman, Frank M. (Frank Michler)
295 Gutenberg downloadsen2025Difficulty 50 (College)
Darwinism. The Noachian Flood A lecture delivered before the Torquay Natural History Society, Jan. 31st, 1870
Stebbing, Thomas Roscoe Rede
295 Gutenberg downloadsen2021Difficulty 68 (Academic)
Meinauer Naturlehre
Unknown
295 Gutenberg downloadsde2009
A New Pocket Gopher (Genus Thomomys), from Eastern Colorado
Hall, E. Raymond (Eugene Raymond)
294 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Bedenkingen tegen de Leer van Darwin Gevolgd door beschouwingen over eenige philosophische onderwerpen.
Reuther, Antoine Charles
294 Gutenberg downloadsnl2009
Descriptions of Two Species of Frogs, Genus Ptychohyla Studies of American Hylid Frogs, V
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293 Gutenberg downloadsen2010Difficulty 59 (Graduate)
Scientific American magazine, Vol. 2 Issue 1 The advocate of Industry and Journal of Scientific, Mechanical and Other Improvements
Various
293 Gutenberg downloadsen2009Difficulty 52 (Graduate)
The Systematic Status of Eumeces pluvialis Cope
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293 Gutenberg downloadsen2011Difficulty 60 (Graduate)
Die organische Chemie in ihrer Anwendung auf Physiologie und Pathologie
Liebig, Justus, Freiherr von
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