02191oam 2200457Ia 450 991069756590332120080916143856.0(CKB)5470000002389292(OCoLC)61224356(EXLCZ)99547000000238929220050808d2005 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierDistribution 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[electronic resource] /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 EnvironmentReston, Va. :U.S. Dept. of the Interior, U.S. Geological Survey,2005.v, 62 pages digital, PDF fileScientific investigations report ;2005-5290At 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).NitratesEnvironmental aspectsSan Luis Valley (Colo. and N.M.)GroundwaterPollutionSan Luis Valley (Colo. and N.M.)Nutrient pollution of waterSan Luis Valley (Colo. and N.M.)NitratesEnvironmental aspectsGroundwaterPollutionNutrient pollution of waterStogner Robert W1391002Rio Grande Water Conservation District (Colo.)Colorado.Department of Public Health and Environment.USGS Colorado Water Science Center.Geological Survey (U.S.)GISGISGPOBOOK9910697565903321Distribution and mass of nitrate in the unconfined aquifer beneath the intensively cultivated area north of the Rio Grande, San Luis Valley, Colorado, 1997 through 20013483672UNINA