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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Walker, James W. - Walker, Audrey G
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 66
    Date: 1979
    Page Range: 731--755
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Walker, James W. - Walker, Audrey G
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 71
    Date: 1984
    Page Range: 464--521
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-