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  1. By: Gordon, David M. - Cook, Francis R.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 94
    Issue: 4
    Date: 1980
    Page Range: 456--457
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Gordon, David M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 104
    Issue: 3
    Date: 1990
    Page Range: 347--353
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Gordon, David M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 93
    Issue: 2
    Date: 1979
    Page Range: 193--195
    Publication Info: Ottawa Ottawa Field-Naturalists' Club