@misc{indiciaecc7b6d252547,
  title = {Agricultural chemicals in Iowa's ground water, 1982-95: What are the trends?},
  author = {Dana W. Koplin and George Hallberg and D. A. Sneck-Fahrer and Robert Libra},
  year = {1997},
  doi = {10.3133/fs11697},
  url = {https://pubs.usgs.gov/publication/fs11697},
  note = {Source identifier: fs11697}
}