@misc{indiciaee5f27ce28b6e,
  title = {Sediment-hosted zinc-lead deposits of the world— Database and grade and tonnage models},
  author = {Donald A. Singer and Vladimir I. Berger and Barry C. Moring},
  year = {2009},
  doi = {10.3133/ofr20091252},
  url = {https://pubs.usgs.gov/publication/ofr20091252},
  note = {Source identifier: ofr20091252}
}