@misc{indiciae2588cde22bbb,
  title = {Digital representation of the Montana state geologic map: A contribution to the Interior Columbia River Basin Ecosystem Management Project},
  author = {G. L. Raines and B. R. Johnson},
  year = {1996},
  doi = {10.3133/ofr95691},
  url = {https://pubs.usgs.gov/publication/ofr95691},
  note = {Source identifier: ofr95691}
}