@misc{indiciae9a3262b72247,
  title = {Preliminary map of thorium provinces in the conterminous United States},
  author = {Mortimer Hay Staatz and Theodore J. Armbrustmacher},
  year = {1982},
  doi = {10.3133/ofr79576u},
  url = {https://pubs.usgs.gov/publication/ofr79576U},
  note = {Source identifier: ofr79576U}
}