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  1. By: Karrer, Joanne L - Webb, Robert W.
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 7
    Date: 1920
    Page Range: 299--305
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Webb, Robert W.
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 6
    Date: 1919
    Page Range: 201--222
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  3. By: Webb, Robert W.
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 8
    Date: 1921
    Page Range: 283--341
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-