@misc{indiciae7e16edaed6a2,
  title = {Water resources data for Puerto Rico},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1968},
  doi = {10.3133/1657},
  url = {https://pubs.usgs.gov/publication/1657},
  note = {Source identifier: 1657}
}