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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Soltis, Douglas E - Haufler, Christopher H - Darrow, David C - Gastony, Gerald Joseph
    Type: Article
    In: American fern journal
    Volume: 73
    Date: 1983
    Page Range: 9--27
    Publication Info: [Washington, etc.] American Fern Society