@misc{indiciae3d4eb1e9f3e7,
  title = {Mineral resources of the United States, 1918: Part I - Metals},
  author = {Gerald Francis Loughlin},
  year = {1921},
  doi = {10.3133/70175825},
  url = {https://pubs.usgs.gov/publication/70175825},
  note = {Source identifier: 70175825}
}