TY - RPRT TI - Water-Quality Assessment of the High Plains Aquifer, 1999-2004 AU - Peter B. McMahon AU - Kevin F. Dennehy AU - Breton W. Bruce AU - Jason J. Gurdak AU - Sharon L. Qi PY - 2007 DO - 10.3133/pp1749 UR - https://pubs.usgs.gov/publication/pp1749 ID - pp1749 ER -