@misc{indiciae8ec725c94ba0,
  title = {Metallogenic map of zinc, lead, and barium deposits and occurrences in Paleozoic sedimentary rocks, east-central United States},
  author = {S. H. B. Clark},
  year = {1988},
  doi = {10.3133/i1773},
  url = {https://pubs.usgs.gov/publication/i1773},
  note = {Source identifier: i1773}
}