@misc{indiciae6df012a7a271,
  title = {Digital data sets describing water use, toxic chemical releases, metropolitan areas, and population density of the conterminous United States},
  author = {Curtis V. Price and Rick M. Clawges},
  year = {1999},
  doi = {10.3133/ofr9978},
  url = {https://pubs.usgs.gov/publication/ofr9978},
  note = {Source identifier: ofr9978}
}