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By: Sloan, Ronald J. - Smith, Harvey RType: ArticleIn: The Canadian field-naturalistVolume: 103Series:Issue: 3Date: 1989Page Range: 411--414Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Smith, Harvey R - DeGraaf, Richard M. - Miller, Richard SType: ArticleIn: The journal of raptor researchVolume: 36Series:Issue: 2Date: 2002Page Range: 144--145Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: