@misc{indiciaefffffaa2b703,
  title = {Geology of the Fort Peck area, Garfield, McCone, and Valley Counties, Montana},
  author = {Fred S. Jensen and Helen Dowling Varnes},
  year = {1964},
  doi = {10.3133/pp414f},
  url = {https://pubs.usgs.gov/publication/pp414F},
  note = {Source identifier: pp414F}
}