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By: Parks, J E - Heck, W R - Hardaswick, VType: ArticleIn: Raptor researchVolume: 20Series:Issue: 1Date: 1986Page Range: 16--20Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects:
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By: Parks, J E - Hardaswick, VType: ArticleIn: The journal of raptor researchVolume: 21Series:Issue: 2Date: 1987Page Range: 70--72Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: