http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Quality of water from public-supply wells in the United States, 1993-2007
National Water-Quality Assessment Program (U.S.)
1 online resource (v, 58 pages) : color illustrations, color maps.
by Patricia L. Toccalino and Jessica A. Hopple.
"National Water-Quality Assessment Program."
Includes bibliographical references (pages 44-50).