From the site: “The Geologic Atlas of the United States is a set of 227 folios published by the U.S. Geological Survey between 1894 and 1945. Each...
From the National Geologic Map Database site: "Geologic map of the east half of the Winston-Salem quadrangle, North Carolina-Virginia"
From the National Geologic Map Database site: "Geologic map of the west half of the Winston-Salem quadrangle, North Carolina, Virginia, and...