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  1. By: Godfread, Carolyn - Barker, William T.
    Type: Article
    In: Rhodora
    Volume: 77
    Date: 1975
    Page Range: 160--161
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  2. By: Barker, William T.
    Type: Article
    In: The University of Kansas science bulletin
    Volume: 48
    Issue: 14
    Date: 1969-10-17
    Page Range: 525--584
    Publication Info: [Lawrence], University of Kansas, [1926-1996]
  3. By: Barker, William T.
    Type: Article
    In: Rhodora
    Volume: 73
    Date: 1971
    Page Range: 58--59
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]