TY  - RPRT
TI  - Occurrence of pesticides in shallow groundwater of the United States: initial results from the National Water-Quality Assessment program
AU  - Dana W. Kolpin
AU  - Jack E. Barbash
AU  - Robert J. Gilliom
PY  - 1998
DO  - 10.1021/es970412g
UR  - https://pubs.usgs.gov/publication/70020644
ID  - 70020644
ER  -