@misc{indiciaeec95f1b21dee,
  title = {Water supply and waste disposal, Culebra, Puerto Rico},
  author = {Donald George Jordan and Bruce K. Gilbert},
  year = {1976},
  doi = {10.3133/wri763},
  url = {https://pubs.usgs.gov/publication/wri763},
  note = {Source identifier: wri763}
}