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  1. By: Clausen, Kristin S. - Hu, Shiu-Ying
    Type: Article
    In: Arnoldia
    Volume: 40
    Issue: 3
    Date: 1980
    Page Range: 139--145
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Howard, Richard A. (Richard Alden), - Clausen, Kristin S.
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 61
    Issue: 4
    Date: 1980
    Page Range: 765--770
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  3. By: Clausen, Kristin S. - Gillis, William Thomas, - Howard, Richard A. (Richard Alden),
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 62
    Issue: 2
    Date: 1981
    Page Range: 211--242
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-