@misc{indiciae8feae50a8a14,
  title = {Assessment of nonpoint-source contamination of the High Plains Aquifer in south-central Kansas, 1987},
  author = {John O. Helgesen and Lloyd E. Stullken and A. T. Rutledge},
  year = {1994},
  doi = {10.3133/wsp2381c},
  url = {https://pubs.usgs.gov/publication/wsp2381C},
  note = {Source identifier: wsp2381C}
}