@misc{indiciaea64051d56fa2,
  title = {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},
  author = {Stogner},
  year = {2005},
  doi = {10.3133/sir20045290},
  url = {https://pubs.usgs.gov/publication/sir20045290},
  note = {Source identifier: sir20045290}
}