TY - RPRT TI - Use of diverse geochemical data sets to determine sources and sinks of nitrate and methane in groundwater, Garfield County, Colorado, 2009 AU - P.B. McMahon AU - J.C. Thomas AU - A.G. Hunt PY - 2011 DO - 10.3133/sir20105215 UR - https://pubs.usgs.gov/publication/sir20105215 ID - sir20105215 ER -