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By: Schmutz, S M - Schmutz, Josef K. (Josef Konrad),Type: ArticleIn: Raptor researchVolume: 9Series:Issue: 3/4Date: 1975Page Range: 58--59Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects:
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By: Gerrard, N - Schmutz, S MType: ArticleIn: The journal of raptor researchVolume: 26Series:Issue: 3Date: 1992Page Range: 198--199Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: