Sacramento, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : U.S. Geological Survey, Information Services [distributor], 2004
Includes bibliographical references (pages 65-68).
Also available via Internet at the USGS web site. Address as of 06/24/04: http://water.usgs.gov/pubs/wri/wri034047/wrir034047.pdf; current access available via PURL.