TY  - RPRT
TI  - A data base of nitrate in ground-water samples from the conterminous United States
AU  - K.J. Lanfear
PY  - 1992
DO  - 10.3133/ofr92652
UR  - https://pubs.usgs.gov/publication/ofr92652
ID  - ofr92652
ER  -