@misc{indiciaef888e258a11d,
  title = {Geologic map of the Central La Plata Quadrangle, Puerto Rico},
  author = {D. H. McIntyre},
  year = {1971},
  doi = {10.3133/i660},
  url = {https://pubs.usgs.gov/publication/i660},
  note = {Source identifier: i660}
}