@misc{indiciaeb051d6c6b051,
  title = {Reported occurrences of selected minerals in Montana},
  author = {C. B. Bentley and George D. Mowat},
  year = {1967},
  doi = {10.3133/mr50},
  url = {https://pubs.usgs.gov/publication/mr50},
  note = {Source identifier: mr50}
}