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By: Densmore, R - Zasada, John C.Type: ArticleIn: The Canadian field-naturalistVolume: 91Series:Issue: 1Date: 1977Page Range: 58--62Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Gard, Nicholas William - Bird, David M. (David Michael), - Densmore, R - Hamel, MType: ArticleIn: The journal of raptor researchVolume: 23Series:Issue: 3Date: 1989Page Range: 99--102Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Zasada, John C. - Densmore, RType: ArticleIn: The Canadian field-naturalistVolume: 93Series:Issue: 1Date: 1979Page Range: 77--79Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: