@misc{indiciaecfa0bbdaa1dd,
  title = {Rough Diamond crystal mine and the Calaveras crystal mine, Calaveras County, California},
  author = {Cordell Durrell and Thomas P. Thayer},
  year = {1943},
  doi = {10.3133/ofr4381},
  url = {https://pubs.usgs.gov/publication/ofr4381},
  note = {Source identifier: ofr4381}
}