1. Geologic map of the Cowan quadrangle, northeastern Kentucky [cartographic material] Yale Public content 1978. 2012-06-13T19:59:26Z. 2012-06-20T14:08:03Z. Blade, Lawrence V. (Lawrence Vernon), 1917-. U.S. Geological Survey. English. Public. Kentucky, Fleming County, Nicholas County, Robertson County, and Mason County.