![Darwin, C. R. 1871. The descent of man, and selection in relation to sex. London: John Murray. Volume. 2. 1st edition. Darwin, C. R. 1871. The descent of man, and selection in relation to sex. London: John Murray. Volume. 2. 1st edition.](http://darwin-online.org.uk/converted/scans/1871_Descent_F937.2(online)/1871_Descent_F937.2_093.jpg)
Darwin, C. R. 1871. The descent of man, and selection in relation to sex. London: John Murray. Volume. 2. 1st edition.
![Wallace, A. R. 1876. The geographical distribution of animals; with a study of the relations of living and extinct faunas as elucidating the past changes of the Earth's surface. Volume 1. Wallace, A. R. 1876. The geographical distribution of animals; with a study of the relations of living and extinct faunas as elucidating the past changes of the Earth's surface. Volume 1.](http://darwin-online.org.uk/converted/Ancillary/1876_GeographicalDistribution_S718.1/geographicaldist01wall_fig001.jpg)
Wallace, A. R. 1876. The geographical distribution of animals; with a study of the relations of living and extinct faunas as elucidating the past changes of the Earth's surface. Volume 1.
![Darwin, C. R. 1871. The descent of man, and selection in relation to sex. London: John Murray. Volume. 2. 1st edition. Darwin, C. R. 1871. The descent of man, and selection in relation to sex. London: John Murray. Volume. 2. 1st edition.](http://darwin-online.org.uk/converted/scans/1871_Descent_F937.2(online)/1871_Descent_F937.2_282.jpg)
Darwin, C. R. 1871. The descent of man, and selection in relation to sex. London: John Murray. Volume. 2. 1st edition.
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