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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Bittner, Jens. - Breckle, Sigmar-W. (Siegmar-Walter),
    Type: Article
    In: American fern journal
    Volume: 85
    Date: 1995
    Page Range: 37--42
    Publication Info: [Washington, etc.] American Fern Society