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By: Wiemeyer, Stanley N. - Frenzel, Richard W. - Anthony, Robert G. - McClelland, B. Riley - Knight, Richard L.Type: ArticleIn: The journal of raptor researchVolume: 23Series:Issue: 4Date: 1989Page Range: 140--146Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: