TY - RPRT TI - Redox Conditions in Selected Principal Aquifers of the United States AU - P.B. McMahon AU - T.K. Cowdery AU - F. H. Chapelle AU - B.C. Jurgens PY - 2009 DO - 10.3133/fs20093041 UR - https://pubs.usgs.gov/publication/fs20093041 ID - fs20093041 ER -