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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Wahl, Herbert A
    Type: Article
    In: Torreya
    Volume: 45
    Issue: 1
    Date: 1945
    Page Range: 1--12
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  2. By: Wahl, Herbert A
    Type: Article
    In: Rhodora
    Volume: 47
    Date: 1945
    Page Range: 41--46
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Clausen, Robert T. (Robert Theodore), - Wahl, Herbert A
    Type: Article
    In: Rhodora
    Volume: 41
    Date: 1939
    Page Range: 28--34
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],