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By: Postupalsky, S - Holt, J BType: ArticleIn: Raptor researchVolume: 9Series:Issue: 1/2Date: 1975Page Range: 18--20Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects:
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By: Bowerman, William W. - Holt, J BType: ArticleIn: The journal of raptor researchVolume: 25Series:Issue: 3Date: 1991Page Range: 96--96Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Holt, J BType: ArticleIn: The journal of raptor researchVolume: 30Series:Issue: 4Date: 1996Page Range: 194--197Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Dykstra, C R - Hays, J L - Simon, M M - Holt, J B - Austing, G. Ronald - Daniel, F. BernardType: ArticleIn: The journal of raptor researchVolume: 38Series:Issue: 4Date: 2004Page Range: 304--311Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: