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  1. The descent of man, and selection in relation to sex.Charles Darwin - 1898 - New York: Plume. Edited by Carl Zimmer.
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  • Charles Darwin’s Notebooks, 1836--1844: Geology, Transmutation of Species, Metaphysical Enquiries.Charles Darwin - 1987 - Ithaca, N.Y.: Cornell University Press. Edited by Paul H. Barrett, Peter Jack Gautrey, Sandra Herbert, David Kohn & Sydney Smith.
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