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By: Rosenfield, Robert N - Bielefeldt, John - Trexel, Dale R. - Doolittle, T C JType: ArticleIn: The journal of raptor researchVolume: 32Series:Issue: 3Date: 1998Page Range: 189--194Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Trexel, Dale R. - Rosenfield, Robert N - Bielefeldt, John - Jacobs, Eugene AType: ArticleIn: The Wilson bulletinVolume: 111Series:Issue: 1Date: 1999Page Range: 7--14Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects: