Tác phẩm Joel Asaph Allen

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WikiPedia: Joel Asaph Allen http://www.whonamedit.com/doctor.cfm/2772.html http://people.wku.edu/charles.smith/biogeog/ALLE18... http://hdl.handle.net/2246/725 http://www.amacad.org/publications/BookofMembers/C... //archive.org/search.php?query=((subject:%22Allen,... http://www.gutenberg.org/ebooks/26512 http://catalog.hathitrust.org/Record/100440155 http://www.nasonline.org/publications/biographical... http://www.nasonline.org/publications/biographical... //www.worldcat.org/oclc/793600662