1965. 2011-12-19T19:34:30Z. 2012-03-05T17:26:15Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Trigg County, Calloway County, Marshall County, Tennessee, Stewart County, and U.S.
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1965. 2011-12-16T16:42:03Z. 2012-03-05T17:25:27Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Trigg County, and U.S.
1965. 2011-12-15T21:23:17Z. 2012-03-05T17:25:18Z. Rogers, William B. U.S. Geological Survey. English. Public. Kentucky, Trigg County, and U.S.