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By: Bartos, Robert. - Olsen, P - Olsen, JType: ArticleIn: The journal of raptor researchVolume: 23Series:Issue: 3Date: 1989Page Range: 117--120Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Olsen, J - Olsen, PType: ArticleIn: Raptor researchVolume: 15Series:Issue: 2Date: 1981Page Range: 53--57Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects:
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By: Olsen, J - Olsen, PType: ArticleIn: Raptor researchVolume: 14Series:Issue: 1Date: 1980Page Range: 10--12Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects: