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By: Bortolotti, Gary R. (Gary Roy), - Dzus, E H - Gerrard, Jonathan M.Type: ArticleIn: The journal of raptor researchVolume: 22Series:Issue: 2Date: 1988Page Range: 66--67Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Dzus, E H - Clark, Robert G.Type: ArticleIn: The Wilson bulletinVolume: 109Series:Issue: 3Date: 1997Page Range: 504--515Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Dzus, E H - Gerrard, Jonathan M.Type: ArticleIn: The Canadian field-naturalistVolume: 103Series:Issue: 1Date: 1989Page Range: 29--33Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Gerrard, Jonathan M. - Gerrard, P. Naomi - Bortolotti, Gary R. (Gary Roy), - Dzus, E HType: ArticleIn: The journal of raptor researchVolume: 26Series:Issue: 3Date: 1992Page Range: 159--166Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Miller, M J R - Wayland, Mark - Dzus, E H - Bortolotti, Gary R. (Gary Roy),Type: ArticleIn: The journal of raptor researchVolume: 34Series:Issue: 3Date: 2000Page Range: 167--174Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: