@misc{indiciaede9a92c90a3f,
  title = {Potentiometric-surface map of water in the Fox Hills-Lower Hell Creek aquifer in the Northern Great Plains area of Montana},
  author = {Gary W. Levings},
  year = {1982},
  doi = {10.3133/ofr82564},
  url = {https://pubs.usgs.gov/publication/ofr82564},
  note = {Source identifier: ofr82564}
}