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By: Gerhardt, Richard P - Gerhardt, Dawn M - Vasquez, Miguel AngelType: ArticleIn: The Wilson bulletinVolume: 109Series:Issue: 1Date: 1997Page Range: 112--120Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Seavy, Nathaniel E - Gerhardt, Richard PType: ArticleIn: The journal of raptor researchVolume: 32Series:Issue: 2Date: 1998Page Range: 175--177Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: