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By: Ellis, David H. (David Harry) - Ellis, Catherine H. - Pendleton, G W - Panteleyev, A V - Rebrova, I V - Markin, Y MType: ArticleIn: The journal of raptor researchVolume: 26Series:Issue: 2Date: 1992Page Range: 81--88Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: