@misc{indiciaef5e5c6ee98d7,
  title = {Ground-water quality at selected sites throughout Puerto Rico, September 1982-July 1983},
  author = {Senen Guzman-Rios and Ferdinand Quinones},
  year = {1984},
  doi = {10.3133/ofr8458},
  url = {https://pubs.usgs.gov/publication/ofr8458},
  note = {Source identifier: ofr8458}
}