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  1. By: Catling, Paul M. - Freedman, W.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 91
    Issue: 4
    Date: 1977
    Page Range: 397--399
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Freedman, W. - Catling, Paul M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 92
    Issue: 2
    Date: 1978
    Page Range: 167--173
    Publication Info: Ottawa Ottawa Field-Naturalists' Club