@misc{indiciaef01f74d4fce3,
  title = {Generalized geologic map of the Butte 1 degree by 2 degrees Quadrangle, Montana},
  author = {C. A. Wallace},
  year = {1987},
  doi = {10.3133/mf1925},
  url = {https://pubs.usgs.gov/publication/mf1925},
  note = {Source identifier: mf1925}
}