@misc{indiciae41c1d06b3541,
  title = {Map showing the association of linear features with metallic mines and prospects in the Butte 1° x 2° quadrangle, Montana},
  author = {L. C. Rowan and C. M. Trautwein and T. L. Purdy},
  year = {1991},
  doi = {10.3133/i2050b},
  url = {https://pubs.usgs.gov/publication/i2050B},
  note = {Source identifier: i2050B}
}