@misc{indiciae0e58bdd45243,
  title = {Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of pesticides in water by C-18 solid-phase extraction and capillary-column gas chromatography/mass spectrometry with selected-ion monitoring},
  author = {Steven D. Zaugg and Mark W. Sandstrom and Steven G. Smith and Kevin M. Fehlberg},
  year = {1995},
  doi = {10.3133/ofr95181},
  url = {https://pubs.usgs.gov/publication/ofr95181},
  note = {Source identifier: ofr95181}
}