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  1. By: Steeves, Margaret Wolfe - Barghoorn, Elso S. (Elso Sterrenberg),
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 40
    Issue: 3
    Date: 1959
    Page Range: 221--259
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-