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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Spurr, Stephen H
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 25
    Issue: 4
    Date: 1944
    Page Range: 467--480
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Grossenbacher, Karl A - Spurr, Stephen H - Vlamis, James
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 26
    Issue: 2
    Date: 1945
    Page Range: 214--228
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-