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  1. By: Holroyd, G L - Banasch, Ursula
    Type: Article
    In: The journal of raptor research
    Volume: 30
    Issue: 3
    Date: 1996
    Page Range: 145--156
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Holroyd, G L - Banasch, Ursula
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 2
    Date: 2003
    Page Range: 98--116
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-