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By: Braun, Michael J. - Robbins, Mark B - Milensky, Christopher M - Barber, Brian R - Hinds, Wiltshire - Prince, Waldyke SType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 123Series:Issue:Date: 2003Page Range: 24--33Publication Info: London, British Ornithologists' Club, 1893-Subjects: