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  1. By: Helleiner, Frederick M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 126
    Issue: 1
    Date: 2012-10-03
    Page Range: 69--70
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Helleiner, Frederick M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 86
    Issue: 1
    Date: 1972
    Page Range: 84--84
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Helleiner, Frederick M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 86
    Issue: 1
    Date: 1972
    Page Range: 84--85
    Publication Info: Ottawa Ottawa Field-Naturalists' Club