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  1. By: Boal, Clint W. - Bibles, Brent D. - Mannan, R W
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 3
    Date: 1997
    Page Range: 286--287
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Bibles, Brent D. - Mannan, R A
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 3
    Date: 2004
    Page Range: 238--242
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Boal, Clint W. - Snyder, H A - Bibles, Brent D. - Estabrook, T S
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 4
    Date: 2003
    Page Range: 277--285
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-