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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Swenson, J E - Hinz, T C - Knapp, Stephen J. - Wentland, Harold J. - Herbert, J T
    Type: Article
    In: Raptor research
    Volume: 15
    Issue: 4
    Date: 1981
    Page Range: 113--120
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]