@misc{indiciaeb0fa262ffbf2,
  title = {Equivalent uranium map of conterminous United States},
  author = {J. S. Duval},
  year = {1989},
  doi = {10.3133/ofr89478},
  url = {https://pubs.usgs.gov/publication/ofr89478},
  note = {Source identifier: ofr89478}
}