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By: Harris, W CType: ArticleIn: Proceedings of the Zoological Society of LondonVolume: 6Series:Issue:Date: 1838Page Range: 1--3Publication Info: London Academic Press, [etc.] 1833-1965Subjects:
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By: Duncan, P A - Harris, W CType: ArticleIn: The journal of raptor researchVolume: 31Series:Issue: 2Date: 1997Page Range: 187--190Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: