TY - RPRT TI - Paleosols in central Illinois as potential sources of ammonium in groundwater AU - Justin J. G. Glessner AU - William R. Roy PY - 2009 DO - 10.1111/j.1745-6592.2009.01257.x UR - https://pubs.usgs.gov/publication/70034464 ID - 70034464 ER -