@misc{indiciaec77d1e17fe7e,
  title = {Preliminary report and geologic map of the Mountain Pass district, San Bernardino County, California},
  author = {Jerry Chipman Olson},
  year = {1952},
  doi = {10.3133/ofr52109},
  url = {https://pubs.usgs.gov/publication/ofr52109},
  note = {Source identifier: ofr52109}
}