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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ball, K. E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 64
    Issue: 6
    Date: 1950
    Page Range: 201--207
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Ball, K. E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 66
    Issue: 3
    Date: 1952
    Page Range: 71--81
    Publication Info: Ottawa Ottawa Field-Naturalists' Club