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By: Dykstra, C R - Hays, J L - Simon, M M - Holt, J B - Austing, G. Ronald - Daniel, F. BernardType: ArticleIn: The journal of raptor researchVolume: 38Series:Issue: 4Date: 2004Page Range: 304--311Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: