TY  - RPRT
TI  - Hydrogeologic, water-quality, and land-use data for the reconnaissance of herbicides and nitrate in near-surface aquifers of the Midcontinental United States, 1991
AU  - D.W. Kolpin
AU  - M. R. Burkart
AU  - E.M. Thurman
PY  - 1993
DO  - 10.3133/ofr93114
UR  - https://pubs.usgs.gov/publication/ofr93114
ID  - ofr93114
ER  -