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By: Gard, Nicholas William - Bird, David M. (David Michael),Type: ArticleIn: The Wilson bulletinVolume: 102Series:Issue: 4Date: 1990Page Range: 605--614Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects:
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By: Gard, Nicholas William - Bird, David M. (David Michael), - Densmore, R - Hamel, MType: ArticleIn: The journal of raptor researchVolume: 23Series:Issue: 3Date: 1989Page Range: 99--102Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: