TY  - RPRT
TI  - Work plan for regional reconnaissance for selected herbicides and nitrate in ground water of the mid-continent United States, 1991
AU  - D.W. Kolpin
AU  - M. R. Burkart
PY  - 1991
DO  - 10.3133/ofr9159
UR  - https://pubs.usgs.gov/publication/ofr9159
ID  - ofr9159
ER  -