@misc{indiciaececa0348d5b6,
  title = {Geologic map of the Aguas Buenas quadrangle, Puerto Rico},
  author = {M. H. Pease},
  year = {1968},
  doi = {10.3133/i479},
  url = {https://pubs.usgs.gov/publication/i479},
  note = {Source identifier: i479}
}