@misc{indiciae9d01d9294a31,
  title = {Geologic map of the Three Buttes Quadrangle, Richland and Roosevelt counties, Montana},
  author = {R. B. Colton},
  year = {1979},
  doi = {10.3133/mf1111},
  url = {https://pubs.usgs.gov/publication/mf1111},
  note = {Source identifier: mf1111}
}