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  1. By: Ballard, Warren B - Farnell, Richard - Stephenson, Robert O.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 97
    Issue: 3
    Date: 1983
    Page Range: 333--333
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Stephenson, Robert O. - Grangaard, Daniel V. - Burch, John
    Type: Article
    In: The Canadian field-naturalist
    Volume: 105
    Issue: 2
    Date: 1991
    Page Range: 255--262
    Publication Info: Ottawa Ottawa Field-Naturalists' Club