@misc{indiciae229cdf037292,
  title = {Geochemical map showing distribution and abundance of lead in silicified rocks, Goldfield mining district, Esmeralda and Nye Counties, Nevada},
  author = {R. P. Ashley and W. J. Keith},
  year = {1973},
  doi = {10.3133/mf476},
  url = {https://pubs.usgs.gov/publication/mf476},
  note = {Source identifier: mf476}
}