@misc{indiciae0dbc55c59c87,
  title = {Preliminary map of tungsten provinces in the conterminous United States},
  author = {S. W. Hobbs and Edwin Wilson Tooker},
  year = {1979},
  doi = {10.3133/ofr79576c},
  url = {https://pubs.usgs.gov/publication/ofr79576C},
  note = {Source identifier: ofr79576C}
}