@misc{indiciae05be78fb2ea4,
  title = {Critical mineral resources of the United States—An introduction},
  author = {Klaus J. Schulz and John H. DeYoung and Robert R. Seal and Dwight Bradley},
  year = {2017},
  doi = {10.3133/pp1802a},
  url = {https://pubs.usgs.gov/publication/pp1802A},
  note = {Source identifier: pp1802A}
}