![Darwin, Francis ed. 1887. The life and letters of Charles Darwin, including an autobiographical chapter. vol. 2. London: John Murray. Darwin, Francis ed. 1887. The life and letters of Charles Darwin, including an autobiographical chapter. vol. 2. London: John Murray.](http://darwin-online.org.uk/converted/scans/1887_Letters_F1452.2(online)/1887_Letters_F1452.2_291.jpg)
Darwin, Francis ed. 1887. The life and letters of Charles Darwin, including an autobiographical chapter. vol. 2. London: John Murray.
![Lyell, Charles. 1863. The geological evidences of the antiquity of man with remarks on the origin of species by variation. 3rd edition, revised. London: John Murray. Lyell, Charles. 1863. The geological evidences of the antiquity of man with remarks on the origin of species by variation. 3rd edition, revised. London: John Murray.](http://darwin-online.org.uk/converted/Ancillary/1863_Lyell_A282_fig02.jpg)
Lyell, Charles. 1863. The geological evidences of the antiquity of man with remarks on the origin of species by variation. 3rd edition, revised. London: John Murray.
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