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By: Cheney, C D - Vander Wall, Stephen B. - Poehlmann, R JType: ArticleIn: The journal of raptor researchVolume: 21Series:Issue: 3Date: 1987Page Range: 103--110Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Ruggiero, L F - Cheney, C DType: ArticleIn: Raptor researchVolume: 13Series:Issue: 2Date: 1979Page Range: 33--36Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects: