https://darwin-online.org.uk/content/contentblock?basepage=1&itemID=APS-B-D25.L%5B.38%5D&hitpage=1&viewtype=side#1
https://darwin-online.org.uk/converted/scans/manuscript scans/AmericanPhilosophicalSociety/1858_Origin_APS-B-D25.L[.38]_001.jpg
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