@misc{indiciaee1c057914ea6,
  title = {Preliminary geologic map of the Butte South quadrangle, Montana},
  author = {Harry W. Smedes},
  year = {1967},
  doi = {10.3133/ofr67203},
  url = {https://pubs.usgs.gov/publication/ofr67203},
  note = {Source identifier: ofr67203}
}