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  1. By: Mitchell, George J.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 73
    Issue: 1
    Date: 1959
    Page Range: 6--13
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Mitchell, George J. - Riegert, Paul W
    Type: Article
    In: The Canadian field-naturalist
    Volume: 108
    Issue: 3
    Date: 1994
    Page Range: 288--291
    Publication Info: Ottawa Ottawa Field-Naturalists' Club