@misc{indiciaea3900e9c3099,
  title = {Herbicides and transformation products in surface waters of the Midwestern United States},
  author = {W.A. Battaglin and E.M. Thurman and S. J. Kalkhoff and S. D. Porter},
  year = {2007},
  doi = {10.1111/j.1752-1688.2003.tb04402.x},
  url = {https://pubs.usgs.gov/publication/70025867},
  note = {Source identifier: 70025867}
}