@misc{indiciae9ca18ea09d7b,
  title = {Geology of Fort Peck Indian Reservation and vicinity, Montana},
  author = {Roger B. Colton and Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1952},
  doi = {10.3133/ofr5338},
  url = {https://pubs.usgs.gov/publication/ofr5338},
  note = {Source identifier: ofr5338}
}