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  1. By: Berger, Robert P. - Baydack, Richard K.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 106
    Issue: 2
    Date: 1992
    Page Range: 185--191
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Kiss, Brian W. - Johnstone, Scott K. - Berger, Robert P.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 124
    Issue: 3
    Date: 2010-07-01
    Page Range: 270--271
    Publication Info: Ottawa Ottawa Field-Naturalists' Club