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  1. By: Marshall, M A
    Type: Article
    In: American fern journal
    Volume: 12
    Date: 1922
    Page Range: 24--24
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Marshall, M A
    Type: Article
    In: American fern journal
    Volume: 12
    Date: 1922
    Page Range: 16--19
    Publication Info: [Washington, etc.] American Fern Society