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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Berry, John D. - Henny, C J
    Type: Article
    In: The journal of raptor research
    Volume: 29
    Issue: 4
    Date: 1995
    Page Range: 279--281
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Phillips, R L - Cummings, J L - Berry, John D.
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 1
    Date: 1992
    Page Range: 43--43
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-