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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Giorgi, Agata Filippini-De - Holderegger, Rolf - Schneller, Johann Jakob
    Type: Article
    In: American fern journal
    Volume: 87
    Date: 1997
    Page Range: 93--103
    Publication Info: [Washington, etc.] American Fern Society