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By: Cowan, P JType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 126Series:Issue:Date: 2006Page Range: 55--59Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Cowan, P JType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 103Series:Issue:Date: 1983Page Range: 44--47Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Cowan, P JType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 102Series:Issue:Date: 1982Page Range: 32--35Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Cowan, P JType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 117Series:Issue:Date: 1997Page Range: 299--303Publication Info: London, British Ornithologists' Club, 1893-Subjects: