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  1. By: Powell, Roger A.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 86
    Issue: 4
    Date: 1972
    Page Range: 377--379
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Powell, Roger A.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 94
    Issue: 1
    Date: 1980
    Page Range: 90--91
    Publication Info: Ottawa Ottawa Field-Naturalists' Club