@misc{indiciaefcaee40efacc,
  title = {Map showing altitude of the top of the Fox Hills-Lower Hell Creek aquifer, Montana},
  author = {Richard D. Feltis},
  year = {1982},
  doi = {10.3133/wri824041},
  url = {https://pubs.usgs.gov/publication/wri824041},
  note = {Source identifier: wri824041}
}