@misc{indiciae8097097e3609,
  title = {Map showing total thickness of the Swift Formation, Montana},
  author = {Richard D. Feltis},
  year = {1982},
  doi = {10.3133/wri824031},
  url = {https://pubs.usgs.gov/publication/wri824031},
  note = {Source identifier: wri824031}
}