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By: Collopy, Michael W. (Michael William)Type: ArticleIn: Raptor researchVolume: 7Series:Issue: 2Date: 1973Page Range: 25--31Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects:
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By: Collopy, Michael W. (Michael William)Type: ArticleIn: The Wilson bulletinVolume: 98Series:Issue: 3Date: 1986Page Range: 445--458Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Collopy, Michael W. (Michael William)Type: ArticleIn: The journal of raptor researchVolume: 22Series:Issue: 2Date: 1988Page Range: 73--73Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: