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By: Ferrero Cantisán, Juan José, - Grande, Juan Manuel - Negro, J JType: ArticleIn: The journal of raptor researchVolume: 37Series:Issue: 1Date: 2003Page Range: 1--7Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Negro, J J - Grande, Juan Manuel - Sarasola, José HernánType: ArticleIn: The journal of raptor researchVolume: 38Series:Issue: 3Date: 2004Page Range: 287--288Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Negro, J J - Bustamante, Javier - Melguizo, C - Ruiz, J L - Grande, Juan ManuelType: ArticleIn: The journal of raptor researchVolume: 34Series:Issue: 4Date: 2000Page Range: 327--329Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: