@misc{indiciae613eb06f1edf,
  title = {National Water-Quality Assessment: Ground-water pilot program},
  author = {William M. Alley and William G. Wilber},
  year = {1988},
  doi = {10.3133/ofr88175},
  url = {https://pubs.usgs.gov/publication/ofr88175},
  note = {Source identifier: ofr88175}
}