@misc{indiciae068cda3361dd,
  title = {Results of a reconnaissance water-quality sampling program of the Ogallala aquifer in Colorado, Kansas, Nebraska, Oklahoma, South Dakota, and Texas},
  author = {Gerald L. Feder and Noel C. Krothe},
  year = {1981},
  doi = {10.3133/wri8165},
  url = {https://pubs.usgs.gov/publication/wri8165},
  note = {Source identifier: wri8165}
}