@misc{indiciae201fdcda8d75,
  title = {Basement map of North America: between latitudes 24° and 60° N},
  author = {American Association of Petroleum Geologists and U.S. Geological Survey},
  year = {1967},
  doi = {10.3133/70211073},
  url = {https://pubs.usgs.gov/publication/70211073},
  note = {Source identifier: 70211073}
}