TY  - RPRT
TI  - Herbicides and nitrate in near-surface aquifers in the midcontinental United States, 1991
AU  - Dana W. Kolpin
AU  - Michael R. Burkart
AU  - E. Michael Thurman
PY  - 1994
DO  - 10.3133/wsp2413
UR  - https://pubs.usgs.gov/publication/wsp2413
ID  - wsp2413
ER  -