LEADER 01779nam  2200421 a 450 
001 9910701211103321
005 20120125134102.0
035   $a(CKB)5470000002416951
035   $a(OCoLC)773825864
035   $a(EXLCZ)995470000002416951
100   $a20120125d2010      ua             0
101 0 $aeng
135   $aurcn|||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 00$aNitrate loads and concentrations in surface-water base flow and shallow groundwater for selected basins in the United States, water years 1990-2006$b[electronic resource] /$fby Norman E. Spahr ... [and others]
210  1$aReston, Va. :$cU.S. Dept. of the Interior, U.S. Geological Survey,$d2010.
215   $a1 online resource (vii, 39 pages) $ccolor illustrations, color maps
225 1 $aScientific investigations report ;$v2010-5098
300   $aTitle from title screen (viewed on Jan. 25, 2012).
300   $a"National Water-Quality Assessment Program."
320   $aIncludes bibliographical references (pages 19-20).
606   $aWater$xNitrogen content$zUnited States
606   $aGroundwater$xQuality$zUnited States
606   $aNitrates$xEnvironmental aspects$zUnited States
615  0$aWater$xNitrogen content
615  0$aGroundwater$xQuality
615  0$aNitrates$xEnvironmental aspects
701   $aSpahr$b Norman E$01384575
712 02$aGeological Survey (U.S.)
712 02$aNational Water-Quality Assessment Program (U.S.)
801  0$bGPO
801  1$bGPO
906   $aBOOK
912   $a9910701211103321
996   $aNitrate loads and concentrations in surface-water base flow and shallow groundwater for selected basins in the United States, water years 1990-2006$93464524
997   $aUNINA