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By: Hromada, Martin - Kuczyński, Lechosław - Skoracki, Maciej - Antczak, Marcin - Tryjanowski, PiotrType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 123ASeries:Issue:Date: 2003Page Range: 226--233Publication Info: London, British Ornithologists' Club, 1893-Subjects: