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By: Petty, S J - Anderson, D. I. K.Type: ArticleIn: The journal of raptor researchVolume: 23Series:Issue: 3Date: 1989Page Range: 113--115Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Petty, S JType: ArticleIn: The journal of raptor researchVolume: 29Series:Issue: 1Date: 1995Page Range: 72--72Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Petty, S J - Shaw, George - Anderson, D. I. K.Type: ArticleIn: The journal of raptor researchVolume: 28Series:Issue: 3Date: 1994Page Range: 134--142Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: