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  1. By: Cook, Robert E.
    Type: Article
    In: Arnoldia
    Volume: 62
    Issue: 1
    Date: 2003
    Page Range: 3--35
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Cook, Robert E.
    Type: Article
    In: Arnoldia
    Volume: 53
    Issue: 4
    Date: 1993
    Page Range: 26--30
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  3. By: Cook, Robert E.
    Type: Article
    In: Arnoldia
    Volume: 65
    Issue: 2
    Date: 2007
    Page Range: 23--29
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  4. By: Cook, Robert E.
    Type: Article
    In: Arnoldia
    Volume: 53
    Issue: 1
    Date: 1993
    Page Range: 19--23
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University