@misc{indiciaefae30f7c3cb7,
  title = {Water Quality in the High Plains Aquifer, Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, 1999-2004},
  author = {Jason J. Gurdak and Peter B. McMahon and Kevin Dennehy and Sharon L. Qi},
  year = {2009},
  doi = {10.3133/cir1337},
  url = {https://pubs.usgs.gov/publication/cir1337},
  note = {Source identifier: cir1337}
}