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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Koller, Gary L. - Shadow, Don O.
    Type: Article
    In: Arnoldia
    Volume: 44
    Issue: 2
    Date: 1984
    Page Range: 17--22
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Koller, Gary L. - Shadow, Don O.
    Type: Article
    In: Arnoldia
    Volume: 51
    Issue: 4
    Date: 1991
    Page Range: 55--58
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University