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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Dunn, David B. - Harmon, William E
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 64
    Date: 1977
    Page Range: 340--365
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Nelson, Jody K - Harmon, William E
    Type: Article
    In: Phytologia
    Volume: 83
    Date: 1997
    Page Range: 286--301
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke