@misc{indiciaea26d67067a07,
  title = {A simple mercury vapor detector for geochemical prospecting},
  author = {William W. Vaughn},
  year = {1967},
  doi = {10.3133/cir540},
  url = {https://pubs.usgs.gov/publication/cir540},
  note = {Source identifier: cir540}
}