@misc{indiciae8c31b1c7a238,
  title = {Geology of the Tonopah mining district, Nevada},
  author = {J. E. Spurr},
  year = {1905},
  doi = {10.3133/pp42},
  url = {https://pubs.usgs.gov/publication/pp42},
  note = {Source identifier: pp42}
}