@misc{indiciae9a1692b46565,
  title = {Geologic map of the Maricao Quadrangle, western Puerto Rico},
  author = {D. H. McIntyre},
  year = {1975},
  doi = {10.3133/i918},
  url = {https://pubs.usgs.gov/publication/i918},
  note = {Source identifier: i918}
}