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By: Johnson, A WType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 84Series:Issue:Date: 1964Page Range: 170--172Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Johnson, A WType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 86Series:Issue:Date: 1966Page Range: 73--75Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Johnson, A WType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 85Series:Issue:Date: 1965Page Range: 84--88Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Johnson, A WType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 84Series:Issue:Date: 1964Page Range: 148--149Publication Info: London, British Ornithologists' Club, 1893-Subjects: