@misc{indiciae1bdac628a864,
  title = {Geologic map of the western Kentucky fluorspar district},
  author = {Stuart Weller and A.H. Sutton},
  year = {1951},
  doi = {10.3133/mf2},
  url = {https://pubs.usgs.gov/publication/mf2},
  note = {Source identifier: mf2}
}