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By: Balbontin, J - Ferrer, Miguel (Ornithologist)Type: ArticleIn: The journal of raptor researchVolume: 36Series:Issue: 3Date: 2002Page Range: 231--235Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Balbontin, J - Ferrer, Miguel (Ornithologist) - Casado, EvaType: ArticleIn: The journal of raptor researchVolume: 35Series:Issue: 1Date: 2001Page Range: 20--23Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: