@misc{indiciaee25138bc05c5,
  title = {Geologic map of the Poplar quadrangle, Roosevelt, Richland, and McCone Counties, Montana},
  author = {R. B. Colton},
  year = {1963},
  doi = {10.3133/i367},
  url = {https://pubs.usgs.gov/publication/i367},
  note = {Source identifier: i367}
}