@misc{indiciae39b14eaa2e8f,
  title = {Gem stones of the United States},
  author = {Dorothy M. Schlegel},
  year = {1957},
  doi = {10.3133/b1042g},
  url = {https://pubs.usgs.gov/publication/b1042G},
  note = {Source identifier: b1042G}
}