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15by Glenn, L. C. (Leonidas Chalmers), 1871-1951“...The Kentucky Geological survey,...”
Published 1922
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16by Weller, J. Marvin (James Marvin), 1899-1976“...The Kentucky Geological survey,...”
Published 1927
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19by Savage, T. E. (Thomas Edmund), 1866-1947“...The Kentucky geological survey,...”
Published 1930
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