@misc{indiciaec34ec3d22abe,
  title = {Preliminary unevaluated geologic map of the Marias River valley area, Toole and Liberty counties, Montana},
  author = {K. H. Holmes and T. E. Bretz},
  year = {1978},
  doi = {10.3133/ofr781047},
  url = {https://pubs.usgs.gov/publication/ofr781047},
  note = {Source identifier: ofr781047}
}