@misc{indiciae8c9a4dd222c2,
  title = {Geology, geochemistry, geophysics, mineral occurrences, and mineral resource assessment for the Commonwealth of Puerto Rico},
  year = {1998},
  doi = {10.3133/ofr9838},
  url = {https://pubs.usgs.gov/publication/ofr9838},
  note = {Source identifier: ofr9838}
}