LEADER 02515oam 2200649 450 001 9910716620703321 005 20210914131412.0 035 $a(CKB)5470000002523962 035 $a(OCoLC)681441246$z(OCoLC)621847892$z(OCoLC)667886830$z(OCoLC)984765473 035 $a(OCoLC)995470000002523962 035 $a(EXLCZ)995470000002523962 100 $a20101115d1997 ua 0 101 0 $aeng 135 $aurbn||||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aRelation of nitrogen and phosphorus in ground water to land use in four subunits of the Potomac River Basin /$fby Scott W. Ator and Janet M. Denis ; prepared as part of the National Water-Quality Assessment (NAWQA) Program 210 1$aBaltimore, Maryland :$cU.S. Geological Survey,$d1997. 215 $a1 online resource (vi, 26 pages) $ccolor illustrations, maps (some color) 225 1 $aWater-resources investigations report ;$v96-4268 320 $aIncludes bibliographical references (pages 24-26). 606 $aGroundwater$xPollution$zPotomac River Watershed 606 $aNitrates$xEnvironmental aspects$zPotomac River Watershed 606 $aWater$xNitrogen content$zPotomac River Watershed 606 $aWater$xPhosphorus content$zPotomac River Watershed 606 $aNutrient pollution of water$zPotomac River Watershed 606 $aGroundwater$xPollution$2fast 606 $aNitrates$xEnvironmental aspects$2fast 606 $aNutrient pollution of water$2fast 607 $aUnited States$zPotomac River Region$2fast 615 0$aGroundwater$xPollution 615 0$aNitrates$xEnvironmental aspects 615 0$aWater$xNitrogen content 615 0$aWater$xPhosphorus content 615 0$aNutrient pollution of water 615 7$aGroundwater$xPollution. 615 7$aNitrates$xEnvironmental aspects. 615 7$aNutrient pollution of water. 700 $aAtor$b Scott W.$01386575 702 $aDenis$b Janet M. 712 02$aGeological Survey (U.S.), 712 02$aNational Water-Quality Assessment Program (U.S.) 801 0$bOCLCE 801 1$bOCLCE 801 2$bOCLCQ 801 2$bOCLCF 801 2$bOCLCQ 801 2$bOCLCO 801 2$bOCLCQ 801 2$bCOP 801 2$bOCLCA 801 2$bGPO 906 $aBOOK 912 $a9910716620703321 996 $aRelation of nitrogen and phosphorus in ground water to land use in four subunits of the Potomac River Basin$93523014 997 $aUNINA