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By: Barnosky, Cathy W. - Grimm, Eric C. - Wright, H. E. Wright, Herbert EdgarType: ArticleIn: Annals of the Carnegie MuseumVolume: 56Series:Issue:Date: 1987-11-20Page Range: 259--273Publication Info: [Pittsburgh], Published by authority of the Board of Trustees of the Carnegie Institute, 1901-Subjects: