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By: Weller, Milton W - Trauger, David L. - Krapu, Gary LType: ArticleIn: The Canadian field-naturalistVolume: 83Series:Issue: 4Date: 1969Page Range: 344--360Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects:
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By: Sparling, Donald W - Krapu, Gary LType: ArticleIn: The Wilson bulletinVolume: 106Series:Issue: 1Date: 1994Page Range: 62--77Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects: