@misc{indiciae3d5d48445260,
  title = {Paleotectonic maps of the Permian System},
  author = {E. D. McKee and S.S. McKee},
  year = {1967},
  doi = {10.3133/i450},
  url = {https://pubs.usgs.gov/publication/i450},
  note = {Source identifier: i450}
}