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  1. By: Doepker, Robert V. - Earle, Richard D. - Ozoga, John J.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 106
    Issue: 3
    Date: 1992
    Page Range: 366--371
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Ozoga, John J. - Doepker, Robert V. - Earle, Richard D.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 106
    Issue: 3
    Date: 1992
    Page Range: 357--360
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Verme, Louis J. - Doepker, Robert V.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 102
    Issue: 3
    Date: 1988
    Page Range: 550--552
    Publication Info: Ottawa Ottawa Field-Naturalists' Club