http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Ground-water levels in the United States, 1966-70
Ground water levels in the United States, 1966-70, southwestern states
prepared in cooperation with the states of Arizona, California, Hawaii, Nevada, and New Mexico, and with other agencies.
Geological Survey water-supply paper ; 2010