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  1. 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-
  2. By: Ellis, David H - 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-