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William Gilson Farlow research assistant 1885-1886 (Mycotree)
William Trelease grad student 1899 Washington University
 (Anatomical Characters of the Seeds of Leguminosae: Chiefly Genera of Gray's Manual)


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Winfield Scott Dudgeon research assistant 1907 Iowa State College
Ada Hayden grad student 1918 Iowa State (Terrestrial Ecology Tree)


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Thomas Jefferson Fitzpatrick collaborator 1899 Iowa State (Terrestrial Ecology Tree)