1971. 2012-03-16T15:31:42Z. 2012-03-27T23:59:42Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Kenton County, Campbell County, Ohio, and Hamilton County.
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1971. 2012-03-14T17:10:05Z. 2013-04-18T14:04:24Z. Gibbons, Anthony B. U.S. Geological Survey. English. Public. Kentucky, Campbell County, and Kenton County.