@misc{indiciae79920c84031e,
  title = {A protocol for onsite screening of volatile organic compounds using a portable gas chromatograph},
  author = {R.D. Brock},
  year = {1990},
  doi = {10.3133/ofr90379},
  url = {https://pubs.usgs.gov/publication/ofr90379},
  note = {Source identifier: ofr90379}
}