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By: Howell, Steve N G - Webb, SophieType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 114Series:Issue:Date: 1994Page Range: 232--243Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Mccallum, D Archibald - Gehlbach, Frederick R., - Webb, SophieType: ArticleIn: The Wilson bulletinVolume: 107Series:Issue: 3Date: 1995Page Range: 530--537Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Howell, S N G - Webb, SophieType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 112Series:Issue:Date: 1992Page Range: 42--49Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Howell, Steve N G - Webb, SophieType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 115Series:Issue:Date: 1995Page Range: 57--66Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Howell, Steve N G - Webb, SophieType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 115Series:Issue:Date: 1995Page Range: 171--177Publication Info: London, British Ornithologists' Club, 1893-Subjects: