@misc{indiciae15abc4d187e9,
  title = {Preliminary geologic map of the Beartooth Mountain quadrangle, Lewis and Clark County, Montana},
  author = {G. D. Robinson and M. E. McCallum},
  year = {1991},
  doi = {10.3133/ofr91113},
  url = {https://pubs.usgs.gov/publication/ofr91113},
  note = {Source identifier: ofr91113}
}