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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Kirkley, John S - Springer, M A
    Type: Article
    In: Raptor research
    Volume: 14
    Issue: 1
    Date: 1980
    Page Range: 22--28
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Springer, M A
    Type: Article
    In: Raptor research
    Volume: 13
    Issue: 1
    Date: 1979
    Page Range: 19--19
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]