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  1. By: Gilbertson, Michael - Hale, Robert
    Type: Article
    In: The Canadian field-naturalist
    Volume: 88
    Issue: 3
    Date: 1974
    Page Range: 356--358
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Gilbertson, Michael - Hale, Robert
    Type: Article
    In: The Canadian field-naturalist
    Volume: 88
    Issue: 3
    Date: 1974
    Page Range: 354--356
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Connors, Peter G. - Anderlini, Victor G. - Risebrough, Robert W. - Gilbertson, Michael - Hays, Helen
    Type: Article
    In: The Canadian field-naturalist
    Volume: 89
    Issue: 2
    Date: 1975
    Page Range: 157--162
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  4. By: Gilbertson, Michael
    Type: Article
    In: The Canadian field-naturalist
    Volume: 88
    Issue: 3
    Date: 1974
    Page Range: 273--280
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Gilbertson, Michael
    Type: Article
    In: The Canadian field-naturalist
    Volume: 102
    Issue: 3
    Date: 1988
    Page Range: 555--557
    Publication Info: Ottawa Ottawa Field-Naturalists' Club