1. Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian Basin from Campbell County Kentucky, to Tazwell County, Virginia Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by U.S. Geological Survey, Information Services Resource Type: Map Access & Availability: Loading
2. Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian Basin from Fayette County, Ohio to Botetourt County, Virginia Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Information Services Resource Type: Map Access & Availability: Loading