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  1. By: Kruckeberg, Arthur R
    Type: Article
    In: American fern journal.
    Volume: 54
    Date: 1964
    Page Range: 113--126
    Publication info: [Washington, etc.]American Fern Society.
  2. By: Kruckeberg, Arthur R
    Type: Article
    In: Madroño; a West American journal of botany.
    Volume: 19
    Date: 1967
    Page Range: 126--129
    Publication info: Berkeley,California Botanical Society.