@misc{indiciaecd7b59c15483,
  title = {Geologic map of the Eastern Pioneer Mountains, Beaverhead County, Montana},
  author = {R. C. Pearson and E-an Zen},
  year = {1985},
  doi = {10.3133/mf1806a},
  url = {https://pubs.usgs.gov/publication/mf1806A},
  note = {Source identifier: mf1806A}
}