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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Spicer, Robert A - Burnham, Robyn J. - Grant, Paul - Glicken, Harry
    Type: Article
    In: American fern journal
    Volume: 75
    Date: 1985
    Page Range: 1--5
    Publication Info: [Washington, etc.] American Fern Society