@misc{indiciae1640b833f421,
  title = {Geochemical map showing distribution and abundance of silver in silicified rocks, Goldfield mining district, Esmeralda and Nye counties, Nevada},
  author = {R. P. Ashley and W. J. Keith},
  year = {1973},
  doi = {10.3133/mf479},
  url = {https://pubs.usgs.gov/publication/mf479},
  note = {Source identifier: mf479}
}