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  1. By: Ellis, David H. (David Harry) - Kery, M
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 3
    Date: 2004
    Page Range: 270--275
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Kery, M
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 3
    Date: 2002
    Page Range: 213--217
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-