http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Ground-water levels in the United States, 1956
prepared under the direction of Philip E. LaMoreaux.
"Prepared in cooperation with the States of Iowa, Kansas, Minnesota, Nebraska, North Dakota, and Wisconsin, and with other agencies."
Geological Survey water-supply paper ; no. 1456