@misc{indiciae90e86971145b,
  title = {Background information to accompany the atlas of some metal and nonmetal mineral provinces in the conterminous United States},
  author = {Edwin Wilson Tooker},
  year = {1980},
  doi = {10.3133/cir792},
  url = {https://pubs.usgs.gov/publication/cir792},
  note = {Source identifier: cir792}
}