@misc{indiciae809d3895156a,
  title = {Marine geologic map of the Puerto Rico insular shelf, Isla Caja de Muertos area},
  author = {David K. Beach and James V. Trumbull},
  year = {1980},
  doi = {10.3133/ofr80366},
  url = {https://pubs.usgs.gov/publication/ofr80366},
  note = {Source identifier: ofr80366}
}