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By: Bergin, Timothy M - Best, Louis B - Freemark, Kathyrn EType: ArticleIn: The Wilson bulletinVolume: 109Series:Issue: 3Date: 1997Page Range: 437--448Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Boutin, Celine - Freemark, Kathyrn E - Kirk, David AnthonyType: ArticleIn: The Canadian field-naturalistVolume: 113Series:Issue: 3Date: 1999Page Range: 430--460Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: