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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Keran, Doug
    Type: Article
    In: Raptor research
    Volume: 15
    Issue: 4
    Date: 1981
    Page Range: 108--112
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Keran, Doug
    Type: Article
    In: Raptor research
    Volume: 12
    Issue: 1-2
    Date: 1978
    Page Range: 15--20
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]