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By: Nelson, R WType: ArticleIn: Raptor researchVolume: 7Series:Issue: 3/4Date: 1973Page Range: 78--96Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects:
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By: White, Clayton M. - Nelson, R WType: ArticleIn: The journal of raptor researchVolume: 25Series:Issue: 3Date: 1991Page Range: 49--62Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Nelson, R WType: ArticleIn: Raptor researchVolume: 6Series:Issue: 1Date: 1972Page Range: 11--15Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects:
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By: Ellis, David H. (David Harry) - Whitlock, Peter L. - Tsengeg, P. - Nelson, R WType: ArticleIn: The journal of raptor researchVolume: 33Series:Issue: 2Date: 1999Page Range: 164--167Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: