@misc{indiciae6c800295890c,
  title = {Geologic and hydrologic data collected at test holes NC-1 and NC-3, Guaynabo and San Juan, eastern Puerto Rico},
  author = {Jesús Rodríguez-Martínez and Richard A. Scharlach and Arturo Torres-Gonzalez},
  year = {1991},
  doi = {10.3133/ofr91217},
  url = {https://pubs.usgs.gov/publication/ofr91217},
  note = {Source identifier: ofr91217}
}