@misc{indiciaefeded3434bad,
  title = {Potassium-argon geochronology of some metamorphic, igneous, and hydrothermal events in Puerto Rico and the Virgin Islands},
  author = {Dennis P. Cox and Richard F. Marvin and John W. McGonigle and David H. McIntyre and Cleaves Lincoln Rogers},
  year = {1977},
  url = {https://pubs.usgs.gov/publication/70233485},
  note = {Source identifier: 70233485}
}