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By: Drewien, R C - Littlefield, C D - Walkinshaw, Lawrence H. - Braun, Clait E.Type: ArticleIn: The Wilson bulletinVolume: 87Series:Issue: 2Date: 1975Page Range: 297--302Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Littlefield, C D - Thompson, Steven P. - Ehlers, Bradley D.Type: ArticleIn: Raptor researchVolume: 18Series:Issue: 1Date: 1984Page Range: 1--5Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects: