@misc{indiciae5d211394222f,
  title = {Geologic map of the Naguabo and part of the Punta Puerca quadrangles, Puerto Rico},
  author = {J. W. M’Gonigle},
  year = {1979},
  doi = {10.3133/i1099},
  url = {https://pubs.usgs.gov/publication/i1099},
  note = {Source identifier: i1099}
}