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  1. By: Dunbar, David L. - Booth, Barry P. - Forsman, Eric D - Hetherington, Ann E. - Wilson, Douglas W.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 105
    Issue: 4
    Date: 1991
    Page Range: 464--468
    Publication Info: Ottawa Ottawa Field-Naturalists' Club