@misc{indiciae9f882993ef7c,
  title = {A well system to recover usable water from a freshwater-saltwater aquifer in Puerto Rico},
  author = {Allen L. Zack},
  year = {1988},
  doi = {10.3133/wsp2328},
  url = {https://pubs.usgs.gov/publication/wsp2328},
  note = {Source identifier: wsp2328}
}