@misc{indiciae040e0c6e21ff,
  title = {Optical calcite deposits in Park and Sweet Grass Counties, Montana},
  author = {W.C. Stoll and Frank C. Armstrong},
  year = {1958},
  doi = {10.3133/b1042m},
  url = {https://pubs.usgs.gov/publication/b1042M},
  note = {Source identifier: b1042M}
}