@misc{indiciaee057ebc6cde3,
  title = {Oxidized zinc deposits of the United States: Part 1. General geology},
  author = {A. V. Heyl and C. N. Bozion},
  year = {1962},
  doi = {10.3133/b1135a},
  url = {https://pubs.usgs.gov/publication/b1135A},
  note = {Source identifier: b1135A}
}