@misc{indiciae2859455687da,
  title = {Mines and prospects of the Butte 1° x 2° Quadrangle, Montana},
  author = {James E. Elliott and Jeffrey S. Loen and K. K. Wise and Michael J. Blaskowski},
  year = {1986},
  doi = {10.3133/ofr86632},
  url = {https://pubs.usgs.gov/publication/ofr86632},
  note = {Source identifier: ofr86632}
}