@misc{indiciae8e9d332b0c82,
  title = {Tungsten in the United States},
  author = {D.M. Lemmon and Ogden Tweto},
  year = {1961},
  doi = {10.3133/ofr6187},
  url = {https://pubs.usgs.gov/publication/ofr6187},
  note = {Source identifier: ofr6187}
}