@misc{indiciaea16c0bff63af,
  title = {Geologic map of the Manati Quadrangle, Puerto Rico},
  author = {W. H. Monroe},
  year = {1971},
  doi = {10.3133/i671},
  url = {https://pubs.usgs.gov/publication/i671},
  note = {Source identifier: i671}
}