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  1. By: Diels, Ludwig, - Markgraff, Richard. - Mansfeld, R. - Schmidt, O.C. - Gilg, Ernst, - Markgraf, T.
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 10
    Issue: 2
    Date: 1929
    Page Range: 75--84
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-