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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Clarkson, Edward Hale,
    Type: Article
    In: American fern journal
    Volume: 9
    Date: 1919
    Page Range: 109--115
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Clarkson, Edward Hale,
    Type: Article
    In: American fern journal
    Volume: 12
    Date: 1922
    Page Range: 19--22
    Publication Info: [Washington, etc.] American Fern Society
  3. By: Clarkson, Edward Hale,
    Type: Article
    In: American fern journal
    Volume: 15
    Date: 1925
    Page Range: 22--23
    Publication Info: [Washington, etc.] American Fern Society
  4. By: Clarkson, Edward Hale,
    Type: Article
    In: American fern journal
    Volume: 18
    Date: 1928
    Page Range: 120--124
    Publication Info: [Washington, etc.] American Fern Society