@misc{indiciaecd268722d7db,
  title = {Ground-water levels in alluvium on the south coast of Puerto Rico, February 1977},
  author = {Jose Raul Diaz},
  year = {1977},
  doi = {10.3133/ofr77696},
  url = {https://pubs.usgs.gov/publication/ofr77696},
  note = {Source identifier: ofr77696}
}