https://darwin-online.org.uk/converted/scans/manuscript scans/AmericanPhilosophicalSociety/1873_subsidy_APS-B-H981.26_001.jpg
https://darwin-online.org.uk/converted/scans/manuscript scans/AmericanPhilosophicalSociety/1873_subsidy_APS-B-H981.26_002.jpg
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