@misc{indiciae2064c439ed0f,
  title = {Significant deposits of gold, silver, copper, lead, and zinc in the United States},
  author = {K. R. Long and J.H. DeYoung and S. Ludington},
  year = {2000},
  doi = {10.2113/gsecongeo.95.3.629},
  url = {https://pubs.usgs.gov/publication/70022329},
  note = {Source identifier: 70022329}
}