@misc{indiciae6c0dca8cde49,
  title = {Marine geologic map of the Puerto Rico insular shelf, Isla Caja de Muertos area},
  author = {D.K. Beach and J.V. Trumbull},
  year = {1981},
  doi = {10.3133/i1265},
  url = {https://pubs.usgs.gov/publication/i1265},
  note = {Source identifier: i1265}
}