@misc{indiciae889833481c27,
  title = {References on the geology of Puerto Rico supplementary to the Bibliography and index of the geology of Puerto Rico and Vicinity, 1866-1968},
  author = {Marjorie Hooker},
  year = {1973},
  doi = {10.3133/ofr73118},
  url = {https://pubs.usgs.gov/publication/ofr73118},
  note = {Source identifier: ofr73118}
}