@misc{indiciae4d975c1c0eaa,
  title = {Geology of the San Juan metropolitan area, Puerto Rico},
  author = {C. A. Kaye},
  year = {1959},
  doi = {10.3133/pp317a},
  url = {https://pubs.usgs.gov/publication/pp317A},
  note = {Source identifier: pp317A}
}