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By: Bates, John M. (John Mark), - Garvin, Mary Catherine - Schmitt, Donna C. - Schmitt, C. GregoryType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 109Series:Issue:Date: 1989Page Range: 236--247Publication Info: London, British Ornithologists' Club, 1893-Subjects: