@misc{indiciae0a58d4f5065a,
  title = {Determination of thallium by a dithizone mixed-color method},
  author = {Roy S. Clarke and Frank Cuttitta},
  year = {1957},
  doi = {10.3133/tei667},
  url = {https://pubs.usgs.gov/publication/tei667},
  note = {Source identifier: tei667}
}