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  1. By: Grant, Paul
    Type: Article
    In: The Canadian field-naturalist
    Volume: 115
    Issue: 4
    Date: 2001
    Page Range: 709--710
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. 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