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By: Swenson, J E - Hinz, T C - Knapp, Stephen J. - Wentland, Harold J. - Herbert, J TType: ArticleIn: Raptor researchVolume: 15Series:Issue: 4Date: 1981Page Range: 113--120Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects:
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By: Hendricks, Paul - Swenson, J EType: ArticleIn: The Canadian field-naturalistVolume: 97Series:Issue: 3Date: 1983Page Range: 307--310Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Swenson, J EType: ArticleIn: The Canadian field-naturalistVolume: 99Series:Issue: 1Date: 1985Page Range: 40--46Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: