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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Haas, Albert Richard Carl
    Type: Article
    In: Botanical gazette
    Volume: 67
    Issue: 5
    Date: 1919
    Page Range: 377--404
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991
  2. By: Haas, Albert Richard Carl
    Type: Article
    In: Botanical gazette
    Volume: 67
    Issue: 4
    Date: 1919
    Page Range: 347--365
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991