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By: Howell, Steve N G - Dowell, Barbara A - James, Douglas A - Behrstock, Robert A - Robbins, Chandler S.Type: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 112Series:Issue:Date: 1992Page Range: 235--244Publication Info: London, British Ornithologists' Club, 1893-Subjects: