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  1. By: Trainor, Colin R. - Debus, Stephen J S - Olsen, Jerry - Norman, Janette A - Christidis, Les
    Type: Article
    In: Forktail
    Volume: 29
    Date: 2013
    Page Range: 100--106
    Publication Info: Oxford,
  2. By: Olsen, Jerry - Georges, Arthur
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 3
    Date: 1993
    Page Range: 149--153
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-