@misc{indiciaed7afa4d6d59d,
  title = {Automated solid-phase extraction of herbicides from water for gas chromatographic-mass spectrometric analysis},
  author = {M. T. Meyer and M. S. Mills and E.M. Thurman},
  year = {1993},
  doi = {10.1016/0021-9673(93)80353-a},
  url = {https://pubs.usgs.gov/publication/70017789},
  note = {Source identifier: 70017789}
}