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Contributions to the Theory of Natural Selection A Series of Essays

Alfred Russel Wallace
Public domain

Concerning Animals and Other Matters

E.H. Aitken
Public domain

Catalogue of British Columbia Birds

Francis Kermode
Public domain

Birds of the Indian Hills

Douglas Dewar
Public domain

Birds of Guernsey (1879)

Cecil Smith
Public domain

Birds in Town and Village

W. H. Hudson
Public domain

Biology A lecture delivered at Columbia University in the series on Science, Philosophy and Art November 20, 1907

Edmund Beecher Wilson
Public domain

At the Deathbed of Darwinism A Series of Papers

Eberhard Dennert
Public domain

Anecdotes of the Habits and Instinct of Animals

R. Lee
Public domain

American Addresses, with a Lecture on the Study of Biology

Thomas Henry Huxley
Public domain
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