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  1. By: Petry, Loren C
    Type: Article
    In: Botanical gazette
    Volume: 57
    Issue: 3
    Date: 1914
    Page Range: 169--192
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991
  2. By: Petry, Loren C
    Type: Article
    In: Botanical gazette
    Volume: 59
    Issue: 5
    Date: 1915
    Page Range: 345--365
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991