@misc{indiciaeef668fd004ec,
  title = {Vulnerability of recently recharged ground water in the High Plains aquifer to nitrate contamination},
  author = {Jason J. Gurdak and Sharon L. Qi},
  year = {2006},
  doi = {10.3133/sir20065050},
  url = {https://pubs.usgs.gov/publication/sir20065050},
  note = {Source identifier: sir20065050}
}