@misc{indiciaeff8588e5fbb4,
  title = {Hydrochemical and sediment data for the Old Lead Belt, southeastern Missouri, 1988-89},
  author = {Brenda J. Smith and John G. Schumacher},
  year = {1991},
  doi = {10.3133/ofr91211},
  url = {https://pubs.usgs.gov/publication/ofr91211},
  note = {Source identifier: ofr91211}
}