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  1. By: Edwards, R. York - Ritcey, Ralph W.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 73
    Issue: 1
    Date: 1959
    Page Range: 21--25
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Edwards, R. York - Ritcey, Ralph W.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 74
    Issue: 1
    Date: 1960
    Page Range: 3--7
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Ritcey, Ralph W. - Verbeek, Nicolaas A. M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 83
    Issue: 4
    Date: 1969
    Page Range: 339--343
    Publication Info: Ottawa Ottawa Field-Naturalists' Club