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  1. By: Hallworth, Beryl - Mychajluk, Michael
    Type: Article
    In: The Canadian field-naturalist
    Volume: 97
    Issue: 3
    Date: 1983
    Page Range: 328--328
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Posey, James B. - Hallworth, Beryl
    Type: Article
    In: The Canadian field-naturalist
    Volume: 101
    Issue: 1
    Date: 1997
    Page Range: 119--120
    Publication Info: Ottawa Ottawa Field-Naturalists' Club