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By: Dean, W. Richard J. (William Richard John), - Dowsett, Robert J - Sakko, Alison - Simmons, R EType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 122Series:Issue:Date: 2002Page Range: 180--185Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Simmons, R EType: ArticleIn: Raptor researchVolume: 18Series:Issue: 3Date: 1984Page Range: 103--106Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects:
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By: Simmons, R E - Avery, D. M. - Avery, Graham M.Type: ArticleIn: The journal of raptor researchVolume: 25Series:Issue: 3Date: 1991Page Range: 63--67Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: