@misc{indiciae95aa983df6bb,
  title = {Generalized tectonic map of North America},
  author = {P. B. King and Gertrude J. Edmonston},
  year = {1972},
  doi = {10.3133/i688},
  url = {https://pubs.usgs.gov/publication/i688},
  note = {Source identifier: i688}
}