TY  - RPRT
TI  - Nutrients in groundwaters of the conterminous United States, 1992-1995
AU  - B. T. Nolan
AU  - J.D. Stoner
PY  - 2000
DO  - 10.1021/es9907663
UR  - https://pubs.usgs.gov/publication/70022942
ID  - 70022942
ER  -