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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Sheffield, E - Douglas, G. E. - Hearne, S J - Huxham, S - Wynn, J. M.
    Type: Article
    In: American fern journal
    Volume: 91
    Date: 2001
    Page Range: 179--186
    Publication Info: [Washington, etc.] American Fern Society