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  1. By: Moorman, C E - Howell, D L - Chapman, Brian R.
    Type: Article
    In: The journal of raptor research
    Volume: 33
    Issue: 3
    Date: 1999
    Page Range: 248--251
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Howell, D L - Chapman, Brian R.
    Type: Article
    In: The journal of raptor research
    Volume: 32
    Issue: 3
    Date: 1998
    Page Range: 257--260
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-