@misc{indiciae9d8a6e733d08,
  title = {Geologic map of the Punta Guayanes Quadrangle, southeastern Puerto Rico},
  author = {C.L. Rogers},
  year = {1977},
  doi = {10.3133/i998},
  url = {https://pubs.usgs.gov/publication/i998},
  note = {Source identifier: i998}
}