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By: Bustnes, Jan O. (Jan Ove) - Asheim, Magne - Bjørn, Tor Harry - Gabrielsen, Heidi - Systad, Geir HType: ArticleIn: The Wilson bulletinVolume: 112Series:Issue: 1Date: 2000Page Range: 8--13Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-Subjects: