@misc{indiciaeb1d7689fc6f7,
  title = {Application of a geographic information system in analyzing the occurrence of atrazine in groundwater of the mid-continental United States},
  author = {M. R. Burkart and D.W. Kolpin},
  year = {1993},
  url = {https://pubs.usgs.gov/publication/70169049},
  note = {Source identifier: 70169049}
}