TY  - RPRT
TI  - Raster dataset showing the probability of elevated concentrations of nitrate in ground water in Colorado, hydrogeomorphic regions and fertilizer use estimates included
AU  - Michael G. Rupert
PY  - 2003
DO  - 10.3133/ofr03234
UR  - https://pubs.usgs.gov/publication/ofr03234
ID  - ofr03234
ER  -