@misc{indiciaed0c0b7671cb8,
  title = {Mineral resources of the United States, 1917: Part I - Metals},
  author = {Hiram Dryer McCaskey},
  year = {1921},
  doi = {10.3133/70175821},
  url = {https://pubs.usgs.gov/publication/70175821},
  note = {Source identifier: 70175821}
}