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  1. By: Killip, Ellsworth P
    Type: Article
    In: American fern journal.
    Volume: 9
    Date: 1919
    Page Range: 5--17
    Publication info: [Washington, etc.]American Fern Society.
  2. By: Killip, Ellsworth P
    Type: Article
    In: American fern journal.
    Volume: 7
    Date: 1917
    Page Range: 36--50
    Publication info: [Washington, etc.]American Fern Society.