TY  - RPRT
TI  - Nitrate concentrations, 1936-99, and pesticide concentrations, 1990-99, in the unconfined aquifer in the San Luis Valley, Colorado
AU  - Stogner
PY  - 2001
DO  - 10.3133/wri014131
UR  - https://pubs.usgs.gov/publication/wri014131
ID  - wri014131
ER  -