Distribution and mass of nitrate in the unconfined aquifer beneath the intensively cultivated area north of the Rio Grande, San Luis Valley, Colorado, 1997 through 2001
by Robert W. Stogner, Sr. ; prepared in cooperation with the Rio Grande Water Conservation District, Center Soil Conservation District, and the Colorado Department of Public Health and Environment
At head of title on HTML title screen: USGS Colorado Water Science Center.
Title from PDF title screen (viewed on Aug. 4, 2005).
Includes bibliographical references (pages 26-28).
Mode of access: Internet at the USGS web site. Address as of 9/16/08: http://pubs.usgs.gov/sir/2004/5290/pdf/508Stogner.pdf ; current access is available via PURL.