TY - RPRT TI - The quality of our Nation's waters: Water quality in the glacial aquifer system, northern United States, 1993-2009 AU - Kelly L. Warner AU - Joseph D. Ayotte PY - 2015 DO - 10.3133/cir1352 UR - https://pubs.usgs.gov/publication/cir1352 ID - cir1352 ER -