@misc{indiciae56f94793c2c1,
  title = {Geochemical map showing distribution and abundance of gold in silicified rocks, Goldfield mining district, Esmeralda and Nye Counties, Nevada},
  author = {R. P. Ashley and W. J. Keith},
  year = {1973},
  doi = {10.3133/mf475},
  url = {https://pubs.usgs.gov/publication/mf475},
  note = {Source identifier: mf475}
}