@misc{indiciaec930ae988728,
  title = {Mineral resources of the United States, 1911: Part I - Metals},
  author = {U.S. Geological Survey},
  year = {1912},
  doi = {10.3133/70175800},
  url = {https://pubs.usgs.gov/publication/70175800},
  note = {Source identifier: 70175800}
}