@misc{indiciaebc7809c78fd8,
  title = {Hydrogeology of the karst of Puerto Rico},
  author = {Ennio V. Giusti},
  year = {1978},
  doi = {10.3133/pp1012},
  url = {https://pubs.usgs.gov/publication/pp1012},
  note = {Source identifier: pp1012}
}