@misc{indiciae0295e3aadc96,
  title = {Geologic map of the United States (exclusive of Alaska and Hawaii)},
  author = {Philip Burke King and Helen M. Beikman and Gertrude J. Edmonston},
  year = {1974},
  doi = {10.3133/70136641},
  url = {https://pubs.usgs.gov/publication/70136641},
  note = {Source identifier: 70136641}
}