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By: Newton, I - Wyllie, IanType: ArticleIn: The journal of raptor researchVolume: 26Series:Issue: 3Date: 1992Page Range: 108--114Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Redpath, S M - Wyllie, IanType: ArticleIn: The journal of raptor researchVolume: 28Series:Issue: 2Date: 1994Page Range: 115--117Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: