@misc{indiciaef669131cfd56,
  title = {The lead-zinc veins of the chilete mining district in northern Peru},
  author = {F.S. Simmons},
  year = {1955},
  doi = {10.2113/gsecongeo.50.4.399},
  url = {https://pubs.usgs.gov/publication/70207317},
  note = {Source identifier: 70207317}
}