![Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1. Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.](http://darwin-online.org.uk/converted/scans/1868_Variation_F878.1(online)/1868_Variation_F878.1_152.jpg)
Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.
![Rutherford, H. W., 1908. Catalogue of the library of Charles Darwin now in the Botany School, Cambridge. Compiled by H. W. Rutherford, of the University Library; with an Introduction by Francis Darwin. Rutherford, H. W., 1908. Catalogue of the library of Charles Darwin now in the Botany School, Cambridge. Compiled by H. W. Rutherford, of the University Library; with an Introduction by Francis Darwin.](http://darwin-online.org.uk/converted/scans/1908_Catalogue_A4(online)/1908_Catalogue_A4_090.jpg)
Rutherford, H. W., 1908. Catalogue of the library of Charles Darwin now in the Botany School, Cambridge. Compiled by H. W. Rutherford, of the University Library; with an Introduction by Francis Darwin.
![Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1. Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.](http://darwin-online.org.uk/converted/scans/1868_Variation_F878.1(online)/1868_Variation_F878.1_151.jpg)
Darwin, C. R. 1868. The variation of animals and plants under domestication. London: John Murray. 1st edition, second issue. Volume 1.
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![Darwin, C. R. 1874. The descent of man, and selection in relation to sex. London: John Murray. 2d ed.; tenth thousand. Darwin, C. R. 1874. The descent of man, and selection in relation to sex. London: John Murray. 2d ed.; tenth thousand.](http://darwin-online.org.uk/converted/scans/1874_Descent_F944(online)/1874_Descent_F944_001.jpg)