1975. 2012-04-27T15:17:42Z. 2012-05-03T15:42:22Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Union County, and Henderson County.
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1975. 2013-08-20T14:55:46Z. 2013-08-30T19:15:58Z. Norris, Ronald L. (Ronald Lee). U.S. Geological Survey. English. Public. Kentucky, Henderson County, and Union County.