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  1. By: Busch, David E. - Degraw, W A - Clampitt, N C
    Type: Article
    In: Raptor research
    Volume: 18
    Issue: 2
    Date: 1984
    Page Range: 74--77
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Busch, David E. - Degraw, W A - Clampitt, N C
    Type: Article
    In: Raptor research
    Volume: 12
    Issue: 3/4
    Date: 1978
    Page Range: 122--125
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]