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  1. By: Jacobson, Michael J - Hodges, John I
    Type: Article
    In: The journal of raptor research
    Volume: 33
    Issue: 4
    Date: 1999
    Page Range: 295--298
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Jacobson, Michael J
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 74--74
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-