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  1. By: Elliott, H Vincent - Cook, Frank S
    Type: Article
    In: Rhodora
    Volume: 72
    Date: 1970
    Page Range: 274--275
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  2. By: Cook, Frank S
    Type: Article
    In: Evansia
    Volume: 18
    Issue: 3
    Date: 2001
    Page Range: 97--103
    Publication Info: Springfield, Mo American Bryological and Lichenological Society c1984-