@misc{indiciaef46d25d22444,
  title = {Basement rock map of the United States, exclusive of Alaska and Hawaii},
  author = {Richard W. Bayley and William R. Muehlberger},
  year = {1968},
  doi = {10.3133/70211241},
  url = {https://pubs.usgs.gov/publication/70211241},
  note = {Source identifier: 70211241}
}