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  1. By: Jenkins, M A - Sherrod, S K - Wiedenfeld, David A. - Wolfe, Donald H. (Donald Howard),
    Type: Article
    In: The journal of raptor research
    Volume: 36
    Issue: 4
    Date: 2002
    Page Range: 324--327
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Wiedenfeld, David A.
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 105
    Date: 1985
    Page Range: 113--116
    Publication Info: London, British Ornithologists' Club, 1893-