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  1. By: Ellis, David H. (David Harry) - Ellis, Catherine H. - Pendleton, G W - Panteleyev, A V - Rebrova, I V - Markin, Y M
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 2
    Date: 1992
    Page Range: 81--88
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-