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  1. By: Clay, William M. - Case, Roberta B - Cunningham, Robert
    Type: Article
    In: Transactions of the Kentucky Academy of Science
    Volume: 16
    Issue: 3
    Date: 1955-08
    Page Range: 57--65
    Publication Info: [Lexington, Ky.], Kentucky Academy of Science, 1923-1997
  2. By: Case, Frederick W., - Case, Roberta B
    Type: Article
    In: Rhodora
    Volume: 76
    Date: 1974
    Page Range: 650--665
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Naczi, Robert F C - Soper, Eric M - Case, Frederick W., - Melo-Costa, Wanessa de - Case, Roberta B
    Type: Article
    In: SIDA, contributions to botany
    Volume: 18
    Date: 1999
    Page Range: 1183--1206
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  4. By: Case, Frederick W., - Case, Roberta B
    Type: Article
    In: Rhodora
    Volume: 78
    Date: 1976
    Page Range: 270--325
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],