TY  - RPRT
TI  - Distribution and mass of nitrate in the unconfined aquifer beneath the intensively cultivated area north of the Rio Grande, San Luis Valley, Colorado, 1997 through 2001
AU  - Stogner
PY  - 2005
DO  - 10.3133/sir20045290
UR  - https://pubs.usgs.gov/publication/sir20045290
ID  - sir20045290
ER  -