@misc{indiciae485636207192,
  title = {Preliminary geologic map of the Shambo quadrangle, Bearpaw Mountains, Montana},
  author = {J.H. Kerr and W. T. Pecora and D. B. Stewart and H.R. Dixon},
  year = {1957},
  doi = {10.3133/i236},
  url = {https://pubs.usgs.gov/publication/i236},
  note = {Source identifier: i236}
}