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By: Wiggers, Ernie P. - Kritz, Kevin JType: ArticleIn: The Wilson bulletinVolume: 103Series:Issue: 4Date: 1991Page Range: 568--577Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Renken, Rochelle B - Wiggers, Ernie P.Type: ArticleIn: The Wilson bulletinVolume: 105Series:Issue: 1Date: 1993Page Range: 77--83Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Wiggers, Ernie P. - Kritz, Kevin JType: ArticleIn: The journal of raptor researchVolume: 28Series:Issue: 1Date: 1994Page Range: 1--3Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: