@misc{indiciae51fe1fa0724b,
  title = {Map showing cumulative thickness of sandstone in the Lakota Formation and equivalent rocks, Montana},
  author = {Richard D. Feltis},
  year = {1982},
  doi = {10.3133/wri824040},
  url = {https://pubs.usgs.gov/publication/wri824040},
  note = {Source identifier: wri824040}
}