@misc{indiciaef317f4730fb2,
  title = {Pre-Quaternary rocks in the Sun River Canyon area, northwestern Montana},
  author = {Melville Rhodes Mudge},
  year = {1972},
  doi = {10.3133/pp663a},
  url = {https://pubs.usgs.gov/publication/pp663A},
  note = {Source identifier: pp663A}
}