https://darwin-online.org.uk/content/contentblock?basepage=1&itemID=RoySoc-RR3.41&hitpage=1&viewtype=side#1
https://darwin-online.org.uk/content/contentblock?basepage=1&itemID=RoySoc-RR3.41&hitpage=1&viewtype=side#2
https://darwin-online.org.uk/converted/scans/manuscript scans/Darwin_C_R_RoySoc-RR3.41_001.jpg
https://darwin-online.org.uk/converted/scans/manuscript scans/Darwin_C_R_RoySoc-RR3.41_002.jpg
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