TY  - RPRT
TI  - Agricultural chemicals in Iowa's ground water, 1982-95: What are the trends?
AU  - Dana W. Koplin
AU  - George Hallberg
AU  - D. A. Sneck-Fahrer
AU  - Robert Libra
PY  - 1997
DO  - 10.3133/fs11697
UR  - https://pubs.usgs.gov/publication/fs11697
ID  - fs11697
ER  -