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  1. By: Sampson, Dexter R
    Type: Article
    In: Botanical Museum leaflets, Harvard University
    Volume: 16
    Issue: 10
    Date: 1954-11-26
    Page Range: 265--303
    Publication Info: Cambridge, Mass Botanical Museum, Harvard University 1932-
  2. By: Sampson, Dexter R
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 36
    Issue: 4
    Date: 1955
    Page Range: 369--384
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-