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  1. By: Trapp, Jon R. - Beier, Paul. - Mack, Curtis M. - Parsons, David R. - Paquet, Paul C.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 122
    Issue: 1
    Date: 2008-01-01
    Page Range: 49--56
    Publication Info: Ottawa Ottawa Field-Naturalists' Club