@misc{indiciae512bb61a5837,
  title = {Contact-metamorphic tungsten deposits of the United States},
  author = {F. L. Hess and E. S. Larsen},
  year = {1922},
  doi = {10.3133/b725d},
  url = {https://pubs.usgs.gov/publication/b725D},
  note = {Source identifier: b725D}
}