009160000a22003250004500500003500000500003900035650001400074650002500088650002200113650002000135650001600155650002300171650002200194650001000216650001400226650001600240651001300256082001700269518001100286530000600297100002600303100002000329100002100349100002100370245011900391260004600510260000900556041000800565300001700573  aCooperative Groundwater Report  aIllinois State Water Survey (ISWS)  aHydrology  aWatershed management  aNatural resources  aFarming systems  aAgriculture  aWater conservation  aRural development  aWells  aChemicals  aGroundwater  aIllinois  a551.48bC371  a980428  aM  aBarnhardt, Michael L.  aMehnert, Edward  aRay, Chitaranjan  aSchock, Susan C.  aCharacterization of the study areas for the pilot study; agricultural chemicals in rural private wells in Illinois  aUSbIllinois State Geological Survey, USA  c1992  aEng  a114p.billus