@misc{indiciaef87c85cd4b2b,
  title = {Virginia ground-water quality},
  author = {J. D. Powell and P. A. Hamilton},
  year = {1987},
  doi = {10.3133/ofr87759},
  url = {https://pubs.usgs.gov/publication/ofr87759},
  note = {Source identifier: ofr87759}
}