@misc{indiciae1378f5f8845e,
  title = {Map showing total thickness of the "Dakota Sandstone," Montana},
  author = {Richard D. Feltis},
  year = {1982},
  doi = {10.3133/wri824037},
  url = {https://pubs.usgs.gov/publication/wri824037},
  note = {Source identifier: wri824037}
}