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  1. By: Thrailkill, James A - Andrews, Lawrence S - Claremont, R M
    Type: Article
    In: The journal of raptor research
    Volume: 34
    Issue: 4
    Date: 2000
    Page Range: 339--340
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Thrailkill, James A - Andrews, Lawrence S
    Type: Article
    In: The journal of raptor research
    Volume: 30
    Issue: 4
    Date: 1996
    Page Range: 248--249
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-