@misc{indiciaee2abc9f04ab9,
  title = {Agricultural chemicals in groundwater of the midwestern United States: Relations to land use},
  author = {D.W. Kolpin},
  year = {1997},
  doi = {10.2134/jeq1997.00472425002600040014x},
  url = {https://pubs.usgs.gov/publication/70019741},
  note = {Source identifier: 70019741}
}