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By: Hofslund, P BType: ArticleIn: The Wilson bulletinVolume: 78Series:Issue: 1Date: 1966Page Range: 79--87Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Hofslund, P BType: ArticleIn: Raptor researchVolume: 7Series:Issue: 3/4Date: 1973Page Range: 107--108Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects: