-
USGS NGMDB: Ewing quadrangle - version 2
From the National Geologic Map Database site: "Geology of the Ewing quadrangle, Kentucky and Virginia" -
USGS NGMDB: Evarts and Hubbard Springs quadrangle
From the National Geologic Map Database site: "Geologic map of the Evarts quadrangle and part of the Hubbard Springs quadrangle, southeastern Kentucky and Virginia" -
USGS NGMDB: Ewing quadrangle
From the National Geologic Map Database site: "Geology of the Ewing quadrangle, Kentucky and Virginia" -
Geologic Atlas: Washington folio, District of Columbia-Maryland-Virginia
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 folio includes both... -
USGS NGMDB: East Winston-Salem quadrangle
From the National Geologic Map Database site: "Geologic map of the east half of the Winston-Salem quadrangle, North Carolina-Virginia" -
USGS NGMDB: West Winston-Salem quadrangle
From the National Geologic Map Database site: "Geologic map of the west half of the Winston-Salem quadrangle, North Carolina, Virginia, and Tennessee"