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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hall, John W.,
    Type: Article
    In: American fern journal
    Volume: 58
    Date: 1968
    Page Range: 77--88
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Hall, John W., - Stidd, Benton M
    Type: Article
    In: Palaeontology
    Volume: 14
    Date: 1971
    Page Range: 431--436
    Publication Info: London, Palaeontological Association, 1957-