@misc{indiciae783b986de67c,
  title = {Geologic map of the Bob Marshall and Great Bear Wildernesses and adjacent study areas, Montana},
  author = {M. R. Mudge and R.L. Earhart},
  year = {1991},
  doi = {10.3133/i2181},
  url = {https://pubs.usgs.gov/publication/i2181},
  note = {Source identifier: i2181}
}