Richmond, Va. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : U.S. Geological Survey, Branch of Information Service [distributor], 2003
Includes bibliographical references (pages 39-44).
Also available via Internet at the USGS web site. Address as of 02/28/04: http://water.usgs.gov/pubs/wri/wri034278/wrir03%5F4278.pdf; current access available via PURL.