@misc{indiciaee82195452e09,
  title = {Preliminary 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 = {2005},
  doi = {10.3133/ofr20051029},
  url = {https://pubs.usgs.gov/publication/ofr20051029},
  note = {Source identifier: ofr20051029}
}