@misc{indiciaed31b53703b80,
  title = {Preliminary general geologic map of the Laredo quadrangle, Bearpaw Mountains, Montana},
  author = {W. T. Pecora and I. J. Witkind and D. B. Stewart},
  year = {1957},
  doi = {10.3133/i234},
  url = {https://pubs.usgs.gov/publication/i234},
  note = {Source identifier: i234}
}