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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 - Clausen, Kristin S
    Type: Article
    In: Journal of the Arnold Arboretum.
    Volume: 61
    Date: 1980
    Page Range: 765--770
    Publication info: Cambridge, Mass. :Arnold Arboretum, Harvard University [etc.],1919-