@misc{indiciae85f361afae13,
  title = {Fluorite in the United States, exclusive of Hawaii},
  author = {Ronald G. Worl and Ralph Erskine Van Alstine and Allen Van Heyl},
  year = {1974},
  doi = {10.3133/mr60},
  url = {https://pubs.usgs.gov/publication/mr60},
  note = {Source identifier: mr60}
}