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  1. By: Spencer, Edwin Rollin,
    Publication info: Chicago, 1921
    Holding Institution: Library of Congress
  1. By: Spencer, Edwin Rollin,
    Type: Article
    In: Botanical gazette
    Volume: 72
    Issue: 5
    Date: 1921
    Page Range: 265--292
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991