@misc{indiciae59512e3b5908,
  title = {Slides showing geology and mineral resources of the eastern Pioneer Mountains, Montana},
  author = {R. C. Pearson and E-an Zen and B. R. Berger},
  year = {1982},
  doi = {10.3133/ofr82712},
  url = {https://pubs.usgs.gov/publication/ofr82712},
  note = {Source identifier: ofr82712}
}