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  1. By: Nekola, Jeffrey C
    Type: Article
    In: The Canadian field-naturalist
    Volume: 124
    Issue: 1
    Date: 2010-01-01
    Page Range: 67--68
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Nekola, Jeffrey C
    Type: Article
    In: American fern journal
    Volume: 87
    Date: 1997
    Page Range: 9--11
    Publication Info: [Washington, etc.] American Fern Society