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By: Rasmussen, Jan F - Rahbek, Carsten - Poulsen, Bent Otto - Poulsen, Michael K - Bloch, HanneType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 116Series:Issue:Date: 1996Page Range: 26--46Publication Info: London, British Ornithologists' Club, 1893-Subjects: