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  1. By: Nicholson, Robert G.
    Type: Article
    In: Arnoldia
    Volume: 46
    Issue: 1
    Date: 1986
    Page Range: 20--29
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Nicholson, Robert G.
    Type: Article
    In: Arnoldia
    Volume: 47
    Issue: 2
    Date: 1987
    Page Range: 3--15
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  3. By: Nicholson, Robert G.
    Type: Article
    In: Arnoldia
    Volume: 49
    Issue: 4
    Date: 1989
    Page Range: 34--39
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  4. By: Nicholson, Robert G.
    Type: Article
    In: Arnoldia
    Volume: 48
    Issue: 2
    Date: 1988
    Page Range: 33--38
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  5. By: Nicholson, Robert G.
    Type: Article
    In: Arnoldia
    Volume: 46
    Issue: 3
    Date: 1986
    Page Range: 23--25
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University