@misc{indiciae0bf0efe15631,
  title = {Geology of the Cayey quadrangle, Puerto Rico},
  author = {H. L. Berryhill and Lynn Glover},
  year = {1960},
  doi = {10.3133/i319},
  url = {https://pubs.usgs.gov/publication/i319},
  note = {Source identifier: i319}
}