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By: Hayes, F E - Goodman, Steven M. - Lopez, N EType: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 110Series:Issue:Date: 1990Page Range: 94--103Publication Info: London, British Ornithologists' Club, 1893-Subjects:
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By: Hayes, F EType: ArticleIn: The journal of raptor researchVolume: 25Series:Issue: 4Date: 1991Page Range: 101--108Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: