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By: Murphy, R K - Hasselblad, K W - Grondahl, C D - Sidle, J G - Martin, R E - Freed, D WType: ArticleIn: The journal of raptor researchVolume: 35Series:Issue: 4Date: 2001Page Range: 322--330Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: