xi, 137 pages : color illustrations, color maps ; 28 cm.
General Note:
"National Water-Quality Assessment Program." Shipping list no.: 2003-0121-P.
Additional Physical Form:
Also available via Internet from the USGS Web site. Address as of 3-18-03: http://water.usgs.gov/pubs/wri/wri02-4243/text.html; current access is available via PURL.