@misc{indiciae2b13f0eff9a0,
  title = {Complete Bouguer gravity map of eastern Puerto Rico and principal facts for gravity stations},
  author = {Andrew Griscom},
  year = {1972},
  doi = {10.3133/ofr72146},
  url = {https://pubs.usgs.gov/publication/ofr72146},
  note = {Source identifier: ofr72146}
}