TY  - RPRT
TI  - Decadal-scale changes of nitrate in ground water of the United States, 1988-2004
AU  - Michael G. Rupert
PY  - 2008
DO  - 10.2134/jeq2007.0055
UR  - https://pubs.usgs.gov/publication/70010011
ID  - 70010011
ER  -