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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ridgway, John E
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 54
    Date: 1967
    Page Range: 95--102
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Ridgway, John E - Skyvarla, John J
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 56
    Date: 1969
    Page Range: 121--124
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-