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By: Beheim, Janne. - Eldegard, K - Bjørnstad, Gro. - Isaksson, Mats - Sonerud, G - Heie, O - Klungland, HelgeType: ArticleIn: The journal of raptor researchVolume: 36Series:Issue: 3Date: 2002Page Range: 218--219Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: