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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Dahl, A Orville
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 33
    Issue: 3
    Date: 1952
    Page Range: 252--295
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Dahl, A Orville
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 36
    Issue: 2-3
    Date: 1955
    Page Range: 159--164
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  3. By: Dahl, A Orville - Rowley, John R
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 46
    Issue: 3
    Date: 1965
    Page Range: 308--323
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-