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  1. By: Duff, G H
    Type: Article
    In: Botanical gazette
    Volume: 69
    Issue: 4
    Date: 1920
    Page Range: 341--346
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991
  2. By: Duff, G H
    Type: Article
    In: Botanical gazette
    Volume: 74
    Issue: 3
    Date: 1922
    Page Range: 264--291
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991