@misc{indiciae1b372acc47b1,
  title = {Thallium contents of 16 USGS standard rocks},
  author = {F.O. Simon and E.Y. Campbell and P. J. Aruscavage},
  year = {1977},
  url = {https://pubs.usgs.gov/publication/70163073},
  note = {Source identifier: 70163073}
}