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By: Mazur, K M - James, P C - Fitzsimmons, Michael J. - Langen, Gido - Espie, R H MType: ArticleIn: The journal of raptor researchVolume: 31Series:Issue: 3Date: 1997Page Range: 253--259Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: