@misc{indiciae3e4137ef0bdb,
  title = {Publications of the U.S. Geological Survey, Water Resources Division, for Puerto Rico and the U.S. Virgin Islands, 1899-1992},
  author = {Ruth I. Guzman-Otero},
  year = {1994},
  doi = {10.3133/ofr93629},
  url = {https://pubs.usgs.gov/publication/ofr93629},
  note = {Source identifier: ofr93629}
}