Water quality in the High Plains Aquifer, Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, 1999-2004 / by Jason J. Gurdak ... [and others].
Title from title screen (viewed July 23, 2009). "National Water-Quality Assessment Program."
Bibliography Note:
Includes bibliographical references (pages 47-49).
Technical Details:
Mode of access: Internet from the USGS web site. Address as of 7/23/09: http://pubs.usgs.gov/circ/1337/pdf/C1337.pdf; current access available via PURL.