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  1. By: Pigg, Kathleen B - Rothwell, Gar W
    Type: Article
    In: Palaeontology
    Volume: 28
    Date: 1985
    Page Range: 545--553
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Pigg, Kathleen B
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 79
    Date: 1992
    Page Range: 589--612
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  3. By: Pigg, Kathleen B
    Type: Article
    In: American fern journal
    Volume: 91
    Date: 2001
    Page Range: 99--114
    Publication Info: [Washington, etc.] American Fern Society