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By: Berkelman, James, - Fraser, James D - Watson, Richard T.Type: ArticleIn: The journal of raptor researchVolume: 29Series:Issue: 1Date: 1995Page Range: 53--53Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Berkelman, James, - Fraser, James D - Watson, Richard T.Type: ArticleIn: The Wilson bulletinVolume: 111Series:Issue: 1Date: 1999Page Range: 15--21Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Berkelman, James, - Fraser, James D - Watson, Richard T.Type: ArticleIn: The journal of raptor researchVolume: 36Series:Issue: 4Date: 2002Page Range: 287--293Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: