@misc{indiciae15c819a4a701,
  title = {Mineral resources of the United States, 1915: Part I - Metals},
  author = {Hiram Dryer McCaskey},
  year = {1917},
  doi = {10.3133/70175814},
  url = {https://pubs.usgs.gov/publication/70175814},
  note = {Source identifier: 70175814}
}