@misc{indiciae76b4ab483394,
  title = {Useful minerals of the United States},
  author = {Frank Charles Schrader and Ralph Walter Stone and Samuel Sanford},
  year = {1917},
  doi = {10.3133/b624},
  url = {https://pubs.usgs.gov/publication/b624},
  note = {Source identifier: b624}
}