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  1. By: Sawyer, W. H.
    Type: Article
    In: American journal of botany
    Volume: 4
    Issue: 9
    Date: 1917-11
    Page Range: 520--532
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  2. By: Sawyer, W. H.
    Type: Article
    In: Botanical gazette
    Volume: 64
    Issue: 3
    Date: 1917
    Page Range: 206--229
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991