@misc{indiciae660bdf8bf147,
  title = {Geologic and structure map of the Choteau 1° x 2° quadrangle, western Montana: A digital database},
  author = {Melville R. Mudge and Robert L. Earhart and James W. Whipple and Jack E. Harrison},
  year = {1982},
  doi = {10.3133/i1300},
  url = {https://pubs.usgs.gov/publication/i1300},
  note = {Source identifier: i1300}
}