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  1. By: Speer, R. J. - Dilworth, T. G.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 92
    Issue: 3
    Date: 1978
    Page Range: 271--274
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Dilworth, T. G.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 88
    Issue: 4
    Date: 1974
    Page Range: 495--498
    Publication Info: Ottawa Ottawa Field-Naturalists' Club