@misc{indiciae43cdfc60faa0,
  title = {Preliminary geologic map-city of Great Falls and vicinity, Montana},
  author = {Richard Walter Lemke and Edwin K. Maughan},
  year = {1955},
  doi = {10.3133/ofr5593},
  url = {https://pubs.usgs.gov/publication/ofr5593},
  note = {Source identifier: ofr5593}
}