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By: Perrins, C M - Mccleery, R HType: ArticleIn: The Wilson bulletinVolume: 101Series:Issue: 2Date: 1989Page Range: 236--253Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Geer, T A - Perrins, C MType: ArticleIn: Raptor researchVolume: 15Series:Issue: 2Date: 1981Page Range: 45--48Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects: