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By: Sulkava, S - Huhtala, KType: ArticleIn: The journal of raptor researchVolume: 31Series:Issue: 2Date: 1997Page Range: 151--159Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Reif, V - Tornberg, Risto - Huhtala, KType: ArticleIn: The journal of raptor researchVolume: 38Series:Issue: 3Date: 2004Page Range: 243--249Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: