@misc{indiciaefc03361da238,
  title = {The Spar fluorspar prospect, Mineral County, Montana},
  author = {C. P. Ross},
  year = {1947},
  doi = {10.3133/ofr4721},
  url = {https://pubs.usgs.gov/publication/ofr4721},
  note = {Source identifier: ofr4721}
}