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  1. By: Cannings, Richard J. (Richard James), - Threlfall, William
    Type: Article
    In: The Wilson bulletin
    Volume: 93
    Issue: 4
    Date: 1981
    Page Range: 519--530
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Cannings, Richard J. (Richard James),
    Type: Article
    In: The Canadian field-naturalist
    Volume: 88
    Issue: 2
    Date: 1974
    Page Range: 232--233
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Vallee, Anne - Cannings, Richard J. (Richard James),
    Type: Article
    In: The Canadian field-naturalist
    Volume: 97
    Issue: 4
    Date: 1983
    Page Range: 450--451
    Publication Info: Ottawa Ottawa Field-Naturalists' Club