@misc{indiciaeca22c2bdd3fd,
  title = {Thorium resources, 1974},
  author = {Mortimer Hay Staatz},
  year = {1976},
  doi = {10.3133/ofr76690},
  url = {https://pubs.usgs.gov/publication/ofr76690},
  note = {Source identifier: ofr76690}
}