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By: Whitacre, David F. (David Frederick) - López Ávila, Juventino. - López Ávila, Gregorio L.Type: ArticleIn: The journal of raptor researchVolume: 36Series:Issue: 1Date: 2002Page Range: 77--81Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: