1967. 2012-01-18T18:53:34Z. 2012-03-05T17:34:22Z. Rogers, William B. U.S. Geological Survey. English. Public. Kentucky, Crittenden County, Caldwell County, and Lyon County.
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1967. 2012-01-18T18:59:36Z. 2012-03-05T17:34:22Z. Sample, Raymond Dewey. U.S. Geological Survey. English. Public. Kentucky, Trigg County, Lyon County, and Caldwell County.