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  1. By: Sperry, John S
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 63
    Issue: 2
    Date: 1982
    Page Range: 173--185
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Sperry, John S
    Type: Article
    In: American fern journal
    Volume: 73
    Date: 1983
    Page Range: 65--72
    Publication Info: [Washington, etc.] American Fern Society
  3. By: Zimmermann, Martin Huldrych, - Sperry, John S
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 64
    Issue: 4
    Date: 1983
    Page Range: 599--609
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-