@misc{indiciae0a1eed696208,
  title = {New cation-exchange method for field speciation of hexavalent chromium},
  author = {James W. Ball},
  year = {2003},
  doi = {10.3133/fs00603},
  url = {https://pubs.usgs.gov/publication/fs00603},
  note = {Source identifier: fs00603}
}