@misc{indiciae94967cb0c0fd,
  title = {Lead in the United States},
  author = {Edwin Thor McKnight and W.L. Newman and Allen Van Heyl},
  year = {1961},
  doi = {10.3133/ofr6194},
  url = {https://pubs.usgs.gov/publication/ofr6194},
  note = {Source identifier: ofr6194}
}