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  1. By: Collins, William B. - Helm, D. J.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 111
    Issue: 4
    Date: 1997
    Page Range: 567--574
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Helm, D. J. - Collins, William B.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 111
    Issue: 4
    Date: 1997
    Page Range: 553--566
    Publication Info: Ottawa Ottawa Field-Naturalists' Club