@misc{indiciaec8339db9db49,
  title = {Map showing altitude of the top of the Lakota Formation and equivalent rocks, Montana},
  author = {Richard D. Feltis},
  year = {1982},
  doi = {10.3133/wri824039},
  url = {https://pubs.usgs.gov/publication/wri824039},
  note = {Source identifier: wri824039}
}