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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Frank, L G - Cooper, J E
    Type: Article
    In: Raptor research
    Volume: 8
    Issue: 1/2
    Date: 1974
    Page Range: 29--32
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Frank, L G - Cooper, J E
    Type: Article
    In: Raptor research
    Volume: 8
    Issue: 1/2
    Date: 1974
    Page Range: 33--36
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  3. By: Cooper, J E - Frank, L G
    Type: Article
    In: Raptor research
    Volume: 8
    Issue: 1/2
    Date: 1974
    Page Range: 20--28
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]