@misc{indiciae9bf61f41e53d,
  title = {Geochemical prospecting with heavy-mineral concentrates used to locate a tungsten deposit},
  author = {Paul Kellogg Theobald and Charles Emmet Thompson},
  year = {1959},
  doi = {10.3133/cir411},
  url = {https://pubs.usgs.gov/publication/cir411},
  note = {Source identifier: cir411}
}