@misc{indiciaee300647db95a,
  title = {Stratigraphy and structure of the western Kentucky fluorspar district},
  author = {R. D. Trace and D.H. Amos},
  year = {1984},
  doi = {10.3133/pp1151d},
  url = {https://pubs.usgs.gov/publication/pp1151D},
  note = {Source identifier: pp1151D}
}