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<http://darwin-online.org.uk/EditorialIntroductions/Freeman_JournalofResearches.html> <http://darwin-online.org.uk/content/frameset?itemID=F1&viewtype=text&pageseq=1> <http://darwin-online.org.uk/content/frameset?itemID=F10.1&viewtype=text&pageseq=1> <http://darwin-online.org.uk/content/frameset?itemID=F10.2&viewtype=text&pageseq=1> <http://darwin-online.org.uk/content/frameset?itemID=F10.2a&viewtype=text&pageseq=1> <http://darwin-online.org.uk/content/frameset?itemID=F14&viewtype=text&pageseq=1> <http://darwin-online.org.uk/content/frameset?itemID=F1497&viewtype=text&pageseq=1> <http://darwin-online.org.uk/content/frameset?itemID=F20&viewtype=text&pageseq=1> <http://darwin-online.org.uk/darwin.html> <http://links.jstor.org/sici?sici=0016-7398%252528196006%252529126%25253A2%25253C129%25253ADAAT%25253E2.0.CO%25253B2-P> <http://www.gutenberg.org/catalog/world/readfile?fk_files=39003&pageno=1> <http://www.robertgordon.net/papers/four.html>

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