@misc{indiciaef54061e85888,
  title = {Preliminary geologic map of the Great Falls-Browns Lake area, northwestern Montana},
  author = {Melville R. Mudge},
  year = {1968},
  doi = {10.3133/ofr68193},
  url = {https://pubs.usgs.gov/publication/ofr68193},
  note = {Source identifier: ofr68193}
}