@misc{indiciaea8a0d89e88ae,
  title = {Preliminary geologic map of the Centennial Mountain quadrangle, Bearpaw Mountains, Montana},
  author = {D. B. Stewart and W. T. Pecora and D.B. Engstrom and H.R. Dixon},
  year = {1957},
  doi = {10.3133/i235},
  url = {https://pubs.usgs.gov/publication/i235},
  note = {Source identifier: i235}
}