1. Geologic map of the Claysville quadrangle, northeastern Kentucky [cartographic material] Yale Public content 1976. 2012-05-23T19:45:53Z. 2012-06-07T16:55:01Z. Luft, Stanley Jeremie, 1927-. U.S. Geological Survey. English. Public. Kentucky, Robertson County, Henderson County, Bracken County, and Pendleton County.