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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Sayers, Amanda - Hamilton, Robert G
    Type: Article
    In: American fern journal
    Volume: 85
    Date: 1995
    Page Range: 47--53
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Hamilton, Robert G - Lloyd, Robert M
    Type: Article
    In: American fern journal
    Volume: 81
    Date: 1991
    Page Range: 95--98
    Publication Info: [Washington, etc.] American Fern Society