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  1. By: Brown, Jessica L. - Heinrich, W R - Jenny, P - Mutch, B D
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 2
    Date: 2004
    Page Range: 148--152
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Garber, Christopher S. - Mutch, B D - Platt, S
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 3
    Date: 1993
    Page Range: 169--171
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-