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  1. By: Whittier, Dean P. - Pant, D D - Nautiyal, D D - Misra, D R
    Type: Article
    In: American fern journal
    Volume: 75
    Date: 1985
    Page Range: 18--18
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Pant, D D - Verma, B. K.
    Type: Article
    In: Palaeontology
    Volume: 6
    Date: 1963
    Page Range: 301--314
    Publication Info: London, Palaeontological Association, 1957-