@misc{indiciaef841e34b5376,
  title = {National water-quality assessment pilot program},
  author = {William G. Wilber and William M. Alley},
  year = {1988},
  doi = {10.3133/ofr88312},
  url = {https://pubs.usgs.gov/publication/ofr88312},
  note = {Source identifier: ofr88312}
}