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By: Gerhardt, Richard P - González, Normandy Bonilla - Gerhardt, Dawn Mcannis - Flatten, Craig JType: ArticleIn: The Wilson bulletinVolume: 106Series:Issue: 4Date: 1994Page Range: 629--639Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Enderson, James - Flatten, Craig J - Jenny, J PType: ArticleIn: The journal of raptor researchVolume: 25Series:Issue: 4Date: 1991Page Range: 123--126Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: