@misc{indiciaed83ff1046998,
  title = {Reconnaissance of the principal springs of Puerto Rico, 1982-83},
  author = {Senen Guzman-Rios},
  year = {1983},
  doi = {10.3133/ofr83683},
  url = {https://pubs.usgs.gov/publication/ofr83683},
  note = {Source identifier: ofr83683}
}