TY  - RPRT
TI  - Agricultural chemicals in groundwater of the midwestern United States: Relations to land use
AU  - D.W. Kolpin
PY  - 1997
DO  - 10.2134/jeq1997.00472425002600040014x
UR  - https://pubs.usgs.gov/publication/70019741
ID  - 70019741
ER  -