01779nam 2200421 a 450 991070121110332120120125134102.0(CKB)5470000002416951(OCoLC)773825864(EXLCZ)99547000000241695120120125d2010 ua 0engurcn|||||||||txtrdacontentcrdamediacrrdacarrierNitrate loads and concentrations in surface-water base flow and shallow groundwater for selected basins in the United States, water years 1990-2006[electronic resource] /by Norman E. Spahr ... [and others]Reston, Va. :U.S. Dept. of the Interior, U.S. Geological Survey,2010.1 online resource (vii, 39 pages) color illustrations, color mapsScientific investigations report ;2010-5098Title from title screen (viewed on Jan. 25, 2012)."National Water-Quality Assessment Program."Includes bibliographical references (pages 19-20).WaterNitrogen contentUnited StatesGroundwaterQualityUnited StatesNitratesEnvironmental aspectsUnited StatesWaterNitrogen contentGroundwaterQualityNitratesEnvironmental aspectsSpahr Norman E1384575Geological Survey (U.S.)National Water-Quality Assessment Program (U.S.)GPOGPOBOOK9910701211103321Nitrate loads and concentrations in surface-water base flow and shallow groundwater for selected basins in the United States, water years 1990-20063464524UNINA