vi, 62 pages : illustrations (some color), color maps ; 28 cm
OCLC
ocm52881129
Includes bibliographical references (pages 35-39).
Also available via Internet at the USGS web site. Address as of 05/18/04: http://ia.water.usgs.gov/nawqa/reports/wrir03-4075.508.pdf; current access available via PURL.