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  1. By: Helleiner, Christopher W.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 87
    Issue: 3
    Date: 1973
    Page Range: 315--315
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Helleiner, Christopher W.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 81
    Issue: 3
    Date: 1967
    Page Range: 230--230
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Helleiner, Christopher W.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 82
    Issue: 2
    Date: 1968
    Page Range: 152--152
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  4. By: Helleiner, Christopher W.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 93
    Issue: 1
    Date: 1979
    Page Range: 66--67
    Publication Info: Ottawa Ottawa Field-Naturalists' Club