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  1. By: Powell, John M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 86
    Issue: 1
    Date: 1972
    Page Range: 81--83
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Powell, John M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 96
    Issue: 3
    Date: 1982
    Page Range: 287--294
    Publication Info: Ottawa Ottawa Field-Naturalists' Club