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100   $a20050808d2005      ua             0
101 0 $aeng
135   $aurmn|||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aDistribution 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$b[electronic resource] /$fby 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
210  1$aReston, Va. :$cU.S. Dept. of the Interior, U.S. Geological Survey,$d2005.
215   $av, 62 pages $cdigital, PDF file
225 1 $aScientific investigations report ;$v2005-5290
300   $aAt head of title on HTML title screen: USGS Colorado Water Science Center.
300   $aTitle from PDF title screen (viewed on Aug. 4, 2005).
320   $aIncludes bibliographical references (pages 26-28).
606   $aNitrates$xEnvironmental aspects$zSan Luis Valley (Colo. and N.M.)
606   $aGroundwater$xPollution$zSan Luis Valley (Colo. and N.M.)
606   $aNutrient pollution of water$zSan Luis Valley (Colo. and N.M.)
615  0$aNitrates$xEnvironmental aspects
615  0$aGroundwater$xPollution
615  0$aNutrient pollution of water
700   $aStogner$b Robert W$01391002
712 02$aRio Grande Water Conservation District (Colo.)
712 02$aColorado.$bDepartment of Public Health and Environment.
712 02$aUSGS Colorado Water Science Center.
712 02$aGeological Survey (U.S.)
801  0$bGIS
801  1$bGIS
801  2$bGPO
906   $aBOOK
912   $a9910697565903321
996   $aDistribution 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$93483672
997   $aUNINA