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By: Gill, Robert E., - Kincheloe, Karen LType: ArticleIn: The journal of raptor researchVolume: 27Series:Issue: 1Date: 1993Page Range: 34--36Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Handel, Colleen M - Gill, Robert E.,Type: ArticleIn: The Wilson bulletinVolume: 104Series:Issue: 1Date: 1992Page Range: 122--135Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects: