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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Patra, Biplab - Bera, Subir
    Type: Article
    In: American fern journal
    Volume: 97
    Date: 2007
    Page Range: 19--19
    Publication Info: [Washington, etc.] American Fern Society
  2. By: Das, Sayantani - Bandyopadhyay, Maumita - Bera, Subir
    Type: Article
    In: American fern journal
    Volume: 102
    Date: 2012
    Page Range: 47--54
    Publication Info: [Washington, etc.] American Fern Society