@misc{indiciaed2c54313042e,
  title = {Geologic map of the Maricao quadrangle, Puerto Rico},
  author = {David H. McIntyre},
  year = {1973},
  doi = {10.3133/ofr73167},
  url = {https://pubs.usgs.gov/publication/ofr73167},
  note = {Source identifier: ofr73167}
}