1. Geologic map of the Scalf quadrangle, southeastern Kentucky [cartographic material] Yale Public content 1975. 2012-05-03T13:46:05Z. 2012-05-09T14:06:13Z. Weis, Paul L. (Paul Lester), 1922-. U.S. Geological Survey. English. Public. Kentucky, Knox County, Clay County, and Bell County.