@misc{indiciae91da5903870f,
  title = {Potentiometric surface of the principal aquifer and hydrologic conditions in the Ponce-Juana Diaz area, Puerto Rico, April-May, 1987},
  author = {Felix Rodriguez-del-Rio and Vicente Quinones-Aponte},
  year = {1989},
  doi = {10.3133/wri894115},
  url = {https://pubs.usgs.gov/publication/wri894115},
  note = {Source identifier: wri894115}
}