@misc{indiciaeda40051ca5ba,
  title = {Geologic map of the igneous and metamorphic rocks of Montana showing location of uranium deposits},
  author = {E. A. Merewether},
  year = {1960},
  doi = {10.3133/i311},
  url = {https://pubs.usgs.gov/publication/i311},
  note = {Source identifier: i311}
}