@misc{indiciae7ec6adbeb893,
  title = {Geologic map of the Great Falls quadrangle, Montana},
  author = {Richard Walter Lemke},
  year = {1977},
  doi = {10.3133/gq1414},
  url = {https://pubs.usgs.gov/publication/gq1414},
  note = {Source identifier: gq1414}
}