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  1. By: Pearson, Robert R - Livezey, Kent B
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 4
    Date: 2003
    Page Range: 265--276
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Livezey, Kent B
    Type: Article
    In: The journal of raptor research
    Volume: 39
    Issue: 1
    Date: 2005
    Page Range: 102--103
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-