@misc{indiciae9f11aac8e3b3,
  title = {The Rio Abajo, Pitahaya, and Daguao formations in eastern Puerto Rico},
  author = {John W. M’Gonigle},
  year = {1977},
  doi = {10.3133/b1435b},
  url = {https://pubs.usgs.gov/publication/b1435B},
  note = {Source identifier: b1435B}
}