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  1. By: Petersen, Raymond L - Francis, Patrick C
    Type: Article
    In: American fern journal.
    Volume: 70
    Date: 1980
    Page Range: 115--118
    Publication info: [Washington, etc.]American Fern Society.
  2. By: Petersen, Raymond L - Fairbrothers, David E
    Type: Article
    In: American fern journal.
    Volume: 70
    Date: 1980
    Page Range: 93--95
    Publication info: [Washington, etc.]American Fern Society.
  3. By: Petersen, Raymond L - Fairbrothers, David E
    Type: Article
    In: American fern journal.
    Volume: 70
    Date: 1980
    Page Range: 73--78
    Publication info: [Washington, etc.]American Fern Society.