@misc{indiciae8b076d23451c,
  title = {Nebraska ground-water quality},
  author = {R. A. Engberg and A.D. Druliner},
  year = {1987},
  doi = {10.3133/ofr87737},
  url = {https://pubs.usgs.gov/publication/ofr87737},
  note = {Source identifier: ofr87737}
}