http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Potentiometric surface map for the Cretaceous Aquifer, Virginia Coastal Plain, 1978
by H.T. Hopkins [and three others] ; prepared in cooperation with the Virginia State Water Control Board, Bureau of Water Control Management.
Relief shown by contours and spot heights.
Includes text, bibliographical references, and 3 ancillary maps.
Water resources investigations (Unnumbered)
Open-file report (Geological Survey (U.S.)) ; 80-765