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  1. By: Wunderlin, Richard P., - Hansen, Bruce F - Franck, Alan R. - Bradley, Keith A - Kunzer, John M
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 4
    Date: 2010
    Page Range: 349--355
    Publication Info: Fort Worth, Tex Botanical Research Institute of Texas 2007-
  2. By: Bradley, Keith A - Woodmansee, Steven W
    Type: Article
    In: SIDA, contributions to botany
    Volume: 20
    Date: 2002
    Page Range: 809--811
    Publication Info: [Dallas W. F. Mahler, etc.] 1962-
  3. By: Bradley, Keith A
    Type: Article
    In: American fern journal
    Volume: 96
    Date: 2006
    Page Range: 112--114
    Publication Info: [Washington, etc.] American Fern Society