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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Sugden, Andrew M
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 63
    Issue: 1
    Date: 1982
    Page Range: 31--61
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Sugden, Andrew M
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 67
    Issue: 2
    Date: 1986
    Page Range: 187--232
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-