Sacramento, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : U.S. Geological Survey, Information Services [distributor], 2004
xi, 61 pages : color illustrations, color map ; 28 cm
OCLC
ocm55657171
"National Water-Quality Assessment Program."
Includes bibliographical references (pages 59-61).
Also available via Internet at the USGS web site. Address as of 08/12/04: http://water.usgs.gov/pubs/wri/wrir034314/wrir034314.pdf ; current access available via PURL.