@misc{indiciae39cc766ae82d,
  title = {A computerized data base of nitrate concentrations in Indiana ground water},
  author = {M.R. Risch and D.A. Cohen},
  year = {1995},
  doi = {10.3133/ofr95468},
  url = {https://pubs.usgs.gov/publication/ofr95468},
  note = {Source identifier: ofr95468}
}