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By: Mason, I JType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 102Series:Issue:Date: 1982Page Range: 99--106Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Mason, I JType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 103Series:Issue:Date: 1983Page Range: 123--128Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Mason, I J - Mckean, J LType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 102Series:Issue:Date: 1982Page Range: 127--129Publication Info: London, British Ornithologists' Club, 1893-Subjects: