@misc{indiciae2c7e5da2c6c4,
  title = {Preliminary geologic map of part of the Butte North quadrangle, Silver Bow, Deer Lodge, and Jefferson Counties, Montana},
  author = {Harry W. Smedes},
  year = {1968},
  doi = {10.3133/ofr68254},
  url = {https://pubs.usgs.gov/publication/ofr68254},
  note = {Source identifier: ofr68254}
}