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  1. By: Cottam, Walter P
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 35
    Issue: 3
    Date: 1954
    Page Range: 239--250
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Cottam, Walter P
    Type: Article
    In: The Great Basin naturalist
    Volume: 30
    Date: 1970
    Page Range: 203--204
    Publication Info: Provo, Utah, M.L. Bean Life Science Museum, Brigham Young University,