@misc{indiciaecd1e403cdbb7,
  title = {Index Map and Maps of Six Mines in the Little Rocky Mountains, Montana},
  author = {Gerald Francis Loughlin},
  year = {1955},
  doi = {10.3133/ofr5597\_alt},
  url = {https://pubs.usgs.gov/publication/ofr5597\_alt},
  note = {Source identifier: ofr5597\_alt}
}