@misc{indiciaedf8a2f062740,
  title = {Preliminary metallogenic map of North America; a numerical listing of deposits},
  author = {Philip White Guild},
  year = {1981},
  doi = {10.3133/cir858a},
  url = {https://pubs.usgs.gov/publication/cir858A},
  note = {Source identifier: cir858A}
}