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  1. By: Robertson, Ian - Stelfox, Harry A.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 83
    Issue: 4
    Date: 1969
    Page Range: 407--408
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Robertson, Ian - Fraker, Mark A.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 88
    Issue: 3
    Date: 1974
    Page Range: 367--367
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Campbell, R. Wayne - Van Der Raay, Brigitta - Robertson, Ian - Petrar, Brian J.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 99
    Issue: 3
    Date: 1985
    Page Range: 337--342
    Publication Info: Ottawa Ottawa Field-Naturalists' Club