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By: Ault, Steven JType: ArticleIn: Raptor researchVolume: 18Series:Issue: 2Date: 1984Page Range: 62--66Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects:
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By: Ault, Steven J - House, E WType: ArticleIn: The journal of raptor researchVolume: 21Series:Issue: 4Date: 1987Page Range: 147--152Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: