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  1. By: Smith, Robert R - Mauk, Joyce E
    Type: Article
    In: American fern journal
    Volume: 68
    Date: 1978
    Page Range: 62--62
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Smith, Robert R - Ward, Daniel B. (Daniel Bertram),‏ ‎
    Type: Article
    In: SIDA, contributions to botany
    Volume: 6
    Date: 1976
    Page Range: 284--310
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-