http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Predicted nitrate and arsenic in basin-fill aquifers of the southwestern United States
National Water-Quality Assessment Program (U.S.)
1 online resource (vi, 25 pages) : color maps + 12 appendices.
"National Water-Quality Assessment Program."
GPO Cataloging Record Distribution Program (CRDP).
Includes bibliographical references (pages 14-15).
Scientific investigations report ; 2012-5065