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By: Henny, C J - Galushin, Vladimir Mikhaĭlovich - Dudin, P I - Khrustov, A V - Mischenko, A L - Moseikin, V N - Sarychev, V. S. - Turchin, V. G.Type: ArticleIn: The journal of raptor researchVolume: 32Series:Issue: 2Date: 1998Page Range: 143--150Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: