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Herbert, S. ed. 1980. The red notebook of Charles Darwin. Bulletin of the British Museum (Natural History) Historical Series 7 (24 April): 1-164.
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Geology of the Sandymush and Canton quadrangles, North Carolina - State Publications II - North Carolina Digital Collections
![Herbert, S. ed. 1980. The red notebook of Charles Darwin. Bulletin of the British Museum (Natural History) Historical Series 7 (24 April): 1-164. Herbert, S. ed. 1980. The red notebook of Charles Darwin. Bulletin of the British Museum (Natural History) Historical Series 7 (24 April): 1-164.](http://darwin-online.org.uk/converted/scans/1980_RedNotebook_F1583e(online)/1980_RedNotebook_F1583e_158.jpg)