@misc{indiciae8a186914c6e3,
  title = {Puerto Rico seismic program},
  author = {Arthur C. Tarr and Kenneth King},
  year = {1976},
  doi = {10.3133/ofr7649},
  url = {https://pubs.usgs.gov/publication/ofr7649},
  note = {Source identifier: ofr7649}
}