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Ideen zu einer Physiognomik der Gewächse (German)
Alexander von Humboldt
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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.
Charles Darwin
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The Antiquity of Man
Sir Charles Lyell
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Ways of Nature
John Burroughs
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The Variation of Animals and Plants Under Domestication, Vol. I.
Charles Darwin
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Metabolic Adaptation to Climate and Distribution of the Raccoon Procyon Lotor and Other Procyonidae
John N. Mugaas, John Seidensticker, and Kathleen P. Mahlke-Johnson
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North American Recent Soft-Shelled Turtles (Family Trionychidae)
Robert G. Webb
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The Variation of Animals and Plants under Domestication
Charles Darwin
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Parasites: A Treatise on the Entozoa of Man and Animals
T. Spencer Cobbold
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The Wonders of Instinct: Chapters in the Psychology of Insects
Jean-Henri Fabre
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On the Origin of Species by Means of Natural Selection
Charles Darwin
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Vertebrates from the Barrier Island of Tamaulipas, México
Richard F. Johnston, Robert K. Selander, B. J. Wilks, and Gerald G. Raun
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A Guide to the Study of Fishes, Volume 2 (of 2)
David Starr Jordan
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Species Plantarum, Sections I-III (Latin)
Carl von Linné
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Fungi: Their Nature and Uses
M. C. Cooke
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Sex-linked Inheritance in Drosophila
Thomas Hunt Morgan and Calvin B. Bridges
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More Letters of Charles Darwin — Volume 2
Charles Darwin
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Darwinism (1889)
Alfred Russel Wallace
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Birds of the Indian Hills
Douglas Dewar
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The Descent of Man and Selection in Relation to Sex, Vol. II (1st Edition)
Charles Darwin
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Zoonomia; Or, the Laws of Organic Life, Vol. II
Erasmus Darwin
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The Amphibians and Reptiles of Michoacán, México
William Edward Duellman
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Mammals of Northwestern South Dakota
J. Knox Jones and Kenneth W. Andersen
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Versuche über Pflanzenhybriden (German)
Gregor Mendel
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The Life of Crustacea
W. T. Calman
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