@misc{indiciae8dcbb11bacda,
  title = {Grade and tonnage model of tungsten skarn deposits, Nevada},
  author = {David A. John and James D. Bliss},
  year = {1994},
  doi = {10.3133/ofr945},
  url = {https://pubs.usgs.gov/publication/ofr945},
  note = {Source identifier: ofr945}
}