@misc{indiciaec4bab45d1a77,
  title = {Herbicides in ground water of the Midwest: A regional study of shallow aquifers, 1991-94},
  author = {Dana W. Kolpin and J. K. Stamer and D. A. Goolsby and E.M. Thurman},
  year = {1998},
  doi = {10.3133/fs07698},
  url = {https://pubs.usgs.gov/publication/fs07698},
  note = {Source identifier: fs07698}
}