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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hahn, Carl R. - Yinger, Barry R.
    Type: Article
    In: Arnoldia
    Volume: 43
    Issue: 4
    Date: 1983
    Page Range: 3--19
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Yinger, Barry R. - Hahn, Carl R.
    Type: Article
    In: Arnoldia
    Volume: 45
    Issue: 2
    Date: 1985
    Page Range: 7--18
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University