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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Etter, Alfred Gordon
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 38
    Date: 1951
    Page Range: 293--375
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Etter, Alfred Gordon
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 40
    Date: 1953
    Page Range: 227--258
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-