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By: Murphy, R K - Gratson, Michael W. - Rosefield, R NType: ArticleIn: The journal of raptor researchVolume: 22Series:Issue: 4Date: 1988Page Range: 97--100Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Gratson, Michael W. - Toepfer, John E. - Anderson, Raymond KType: ArticleIn: The Canadian field-naturalistVolume: 104Series:Issue: 4Date: 1990Page Range: 561--566Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: