@misc{indiciae2b1107c589c6,
  title = {Geologic map of the Naranjito quadrangle, Puerto Rico},
  author = {M. H. Pease},
  year = {1968},
  doi = {10.3133/i508},
  url = {https://pubs.usgs.gov/publication/i508},
  note = {Source identifier: i508}
}