@misc{indiciaef727cef9a703,
  title = {Mineral resources in Permian rocks of southwest Montana},
  author = {Roger Warren Swanson},
  year = {1970},
  doi = {10.3133/pp313e},
  url = {https://pubs.usgs.gov/publication/pp313E},
  note = {Source identifier: pp313E}
}