@misc{indiciaede65eaf58966,
  title = {Determination of small and large amounts of fluorine in rocks},
  author = {F. S. Grimaldi and B. Ingram and F. Cuttitta},
  year = {1955},
  url = {https://pubs.usgs.gov/publication/70010723},
  note = {Source identifier: 70010723}
}