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  1. By: Wagner, Richard J. - Wagner, Anstiss B. - Howard, Richard A. (Richard Alden),
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 50
    Issue: 4
    Date: 1969
    Page Range: 556--565
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-