@misc{indiciae396a3cd8e545,
  title = {Water resources data: Puerto Rico and the U.S. Virgin Islands},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1984},
  doi = {10.3133/914},
  url = {https://pubs.usgs.gov/publication/914},
  note = {Source identifier: 914}
}