@misc{indiciaec273a9ffbc53,
  title = {Assessment of undiscovered deposits of gold, silver, copper, lead, and zinc in the United States: A Portable Document (PDF) recompilation of USGS Open-File Report 96-96 and Circular 1178},
  author = {The U.S. Geological Survey National Mineral Resource Assessment Team},
  year = {2002},
  doi = {10.3133/ofr2002198},
  url = {https://pubs.usgs.gov/publication/ofr2002198},
  note = {Source identifier: ofr2002198}
}