1. Geologic map of the Fort Knox quadrangle, north-central Kentucky [cartographic material] Yale Public content 1977. 2012-06-04T18:05:26Z. 2012-06-13T15:03:56Z. Kepferle, Roy Clark, 1926-. U.S. Geological Survey. English. Public. Kentucky, Hardin County, Bullitt County, Meade County, and U.S.