@misc{indiciaef97bf0317ce7,
  title = {Geology of the Upper Stillwater Basin, Stillwater and Carbon counties, Montana, with special reference to coal and oil},
  author = {W. R. Calvert},
  year = {1917},
  doi = {10.3133/b641g},
  url = {https://pubs.usgs.gov/publication/b641G},
  note = {Source identifier: b641G}
}