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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1968. 2012-02-16T21:04:56Z. 2012-03-05T17:41:25Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Graves County, and Marshall County.