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  1. By: Czapka, Stephen J - Johnson, L. Scott (Lyle Scott),
    Type: Article
    In: The Wilson bulletin
    Volume: 112
    Issue: 1
    Date: 2000
    Page Range: 72--81
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Johnson, L. Scott (Lyle Scott),
    Type: Article
    In: Raptor research
    Volume: 17
    Issue: 3
    Date: 1983
    Page Range: 93--93
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]