@misc{indiciaef6260d8a31d3,
  title = {Geology and fluorspar deposits of the Levias-Keystone and Dike-Eaton areas, Crittenden County, Kentucky},
  author = {Robert Denny Trace},
  year = {1962},
  doi = {10.3133/b1122e},
  url = {https://pubs.usgs.gov/publication/b1122E},
  note = {Source identifier: b1122E}
}