@misc{indiciae17859141a6a4,
  title = {Geologic factors in the interpretation of fluorspar reserves in the Illinois-Kentucky field},
  author = {Louis W. Currier},
  year = {1937},
  doi = {10.3133/b886b},
  url = {https://pubs.usgs.gov/publication/b886B},
  note = {Source identifier: b886B}
}