@misc{indiciae2e72c5109116,
  title = {Preliminary map of platinum and platinum-group metal provinces in the conterminous United States},
  author = {Norman J. Page and Edwin Wilson Tooker},
  year = {1979},
  doi = {10.3133/ofr79576b},
  url = {https://pubs.usgs.gov/publication/ofr79576B},
  note = {Source identifier: ofr79576B}
}