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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: Gerrard, Jonathan M. - Gerrard, P. Naomi - Whitfield, Douglas W. A.Type: ArticleIn: The Canadian field-naturalistVolume: 94Series:Issue: 4Date: 1980Page Range: 391--397Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Gerrard, Jonathan M. - Harmata, A R - Gerrard, P. NaomiType: ArticleIn: The journal of raptor researchVolume: 26Series:Issue: 4Date: 1992Page Range: 229--234Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Gerrard, Jonathan M. - Whitfield, Douglas W. A. - Gerrard, Peter - Gerrard, P. Naomi - Maher, William JType: ArticleIn: The Canadian field-naturalistVolume: 92Series:Issue: 4Date: 1978Page Range: 375--382Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Gerrard, P. Naomi - Wiemeyer, Stanley N. - Gerrard, Jonathan M.Type: ArticleIn: Raptor researchVolume: 13Series:Issue: 2Date: 1979Page Range: 57--64Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects: