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  1. By: Houston, C Stuart - L'Arrivée, Louis P. - Blokpoel, Hans,
    Type: Article
    In: The Canadian field-naturalist
    Volume: 105
    Issue: 3
    Date: 1991
    Page Range: 416--416
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: L'Arrivée, Louis P. - Blokpoel, Hans,
    Type: Article
    In: The Canadian field-naturalist
    Volume: 104
    Issue: 4
    Date: 1990
    Page Range: 534--539
    Publication Info: Ottawa Ottawa Field-Naturalists' Club