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  1. By: Warren, Richard - Johnson, Ethan W.
    Type: Article
    In: Arnoldia
    Volume: 48
    Issue: 1
    Date: 1988
    Page Range: 3--48
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Johnson, Ethan W.
    Type: Article
    In: Arnoldia
    Volume: 49
    Issue: 1
    Date: 1989
    Page Range: 61--64
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University