@misc{indiciae4ba1a2a4d73d,
  title = {Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group: Determination of selected herbicides and their degradation products in water using solid-phase extraction and gas chromatography/mass spectrometry},
  author = {J.L. Kish and E.M. Thurman and E.A. Scribner and L.R. Zimmerman},
  year = {2000},
  doi = {10.3133/ofr00385},
  url = {https://pubs.usgs.gov/publication/ofr00385},
  note = {Source identifier: ofr00385}
}