https://darwin-online.org.uk/content/contentblock?basepage=1&itemID=UBC-RBSC-ARC-1731-1-43&hitpage=1&viewtype=side#1
https://darwin-online.org.uk/content/contentblock?basepage=1&itemID=UBC-RBSC-ARC-1731-1-43&hitpage=1&viewtype=side#2
https://darwin-online.org.uk/converted/scans/manuscript scans/Burdon-Sanderson_UBC-RBSC-ARC-1731-1-43_001.jpg
https://darwin-online.org.uk/converted/scans/manuscript scans/Burdon-Sanderson_UBC-RBSC-ARC-1731-1-43_002.jpg
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