@misc{indiciaef93b114e4e71,
  title = {Bibliographies and location maps of publications on aeromagnetic and aeroradiometric surveys for Puerto Rico and large areas of the conterminous United States},
  author = {Patricia L. Hill},
  year = {1991},
  doi = {10.3133/ofr91370f},
  url = {https://pubs.usgs.gov/publication/ofr91370F},
  note = {Source identifier: ofr91370F}
}