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  1. By: Richard, Pierre R. - Campbell, Robert R.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 102
    Issue: 2
    Date: 1988
    Page Range: 337--350
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Richard, Pierre R.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 107
    Issue: 4
    Date: 1993
    Page Range: 524--532
    Publication Info: Ottawa Ottawa Field-Naturalists' Club