@misc{indiciaee9aae489b9a4,
  title = {Gold in the United States},
  author = {Albert Herbert Koschmann and M.H. Bergendahl},
  year = {1961},
  doi = {10.3133/ofr6185},
  url = {https://pubs.usgs.gov/publication/ofr6185},
  note = {Source identifier: ofr6185}
}