@misc{indiciaec8cf5870d423,
  title = {Precambrian basement structure map of the continental United States - An interpretation of geologic and aeromagnetic data},
  author = {Paul K. Sims and Richard W. Saltus and Eric D. Anderson},
  year = {2008},
  doi = {10.3133/sim3012},
  url = {https://pubs.usgs.gov/publication/sim3012},
  note = {Source identifier: sim3012}
}