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  1. By: Ballard, Warren B - Krausman, Paul R., - Boe, Sue - Cunningham, Stan - Whitlaw, Heather A.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 114
    Issue: 2
    Date: 2000
    Page Range: 241--247
    Publication Info: Ottawa Ottawa Field-Naturalists' Club