@misc{indiciae938836218bc6,
  title = {Preliminary map of tin occurrence areas in the conterminous United States},
  author = {Bruce L. Reed and Edwin Wilson Tooker},
  year = {1980},
  doi = {10.3133/ofr79576l},
  url = {https://pubs.usgs.gov/publication/ofr79576L},
  note = {Source identifier: ofr79576L}
}