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By: Yates, Richard E - McClelland, B. Riley - Mcclelland, P T - Key, Carl H - Bennetts, Robert EType: ArticleIn: The journal of raptor researchVolume: 35Series:Issue: 2Date: 2001Page Range: 81--90Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: