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By: Severinghaus, W. D. (William D.) - Riggins, R. E. (Robert E.) - Goran, William D. (William David)Type: ArticleIn: Transactions of the Kentucky Academy of ScienceVolume: 41Series:Issue: 1-2Date: 1980-03Page Range: 15--26Publication Info: [Lexington, Ky.], Kentucky Academy of Science, 1923-1997Subjects: