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By: Ericson, Per G. P.Type: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 117Series:Issue:Date: 1997Page Range: 19--26Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Ericson, Per G. P. - Amarilla, Luis AlbertoType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 117Series:Issue:Date: 1997Page Range: 60--67Publication Info: London, British Ornithologists' Club, 1893-Subjects: