TY - RPRT TI - Water-quality data from the observation-well network in Illinois, 1985-87 AU - D. C. Voelker AU - D.J. Oberg AU - M.J. Grober PY - 1988 DO - 10.3133/ofr87538 UR - https://pubs.usgs.gov/publication/ofr87538 ID - ofr87538 ER -