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  1. By: Henny, C J - Blus, Lawrence J. - Kaiser, T Earl
    Type: Article
    In: Raptor research
    Volume: 18
    Issue: 2
    Date: 1984
    Page Range: 41--48
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Ohlendorf, Harry M. - Klaas, Erwin E - Kaiser, T Earl
    Type: Article
    In: The Wilson bulletin
    Volume: 90
    Issue: 4
    Date: 1978
    Page Range: 608--618
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-