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  1. By: Clark, Karen L - Robertson, Raleigh J
    Type: Article
    In: The Wilson bulletin
    Volume: 93
    Issue: 2
    Date: 1981
    Page Range: 249--258
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Clark, Karen L - Euler, David - Armstrong, Edward
    Type: Article
    In: The Wilson bulletin
    Volume: 95
    Issue: 1
    Date: 1983
    Page Range: 77--96
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Clark, Karen L
    Type: Article
    In: The Canadian field-naturalist
    Volume: 100
    Issue: 4
    Date: 1986
    Page Range: 463--469
    Publication Info: Ottawa Ottawa Field-Naturalists' Club