@misc{indiciae9029750bd2b4,
  title = {Geology of the Central Aguirre quadrangle, Puerto Rico},
  author = {H. L. Berryhill},
  year = {1960},
  doi = {10.3133/i318},
  url = {https://pubs.usgs.gov/publication/i318},
  note = {Source identifier: i318}
}