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By: Hockey, P A RType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 102Series:Issue:Date: 1982Page Range: 77--83Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Baker, Allan J. - Hockey, P A RType: ArticleIn: The Wilson bulletinVolume: 96Series:Issue: 4Date: 1984Page Range: 656--671Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects: