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  1. By: Swales, Dorothy E. - Bider, J. Roger
    Type: Article
    In: The Canadian field-naturalist
    Volume: 84
    Issue: 1
    Date: 1970
    Page Range: 49--53
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Swales, Dorothy E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 89
    Issue: 2
    Date: 1975
    Page Range: 143--147
    Publication Info: Ottawa Ottawa Field-Naturalists' Club