@misc{indiciae9d26fcc04618,
  title = {Preliminary tectonostratigraphic terrane map of the central and southern Appalachians},
  author = {J. Wright Horton and Avery A. Drake and D.W. Rankin and R.D. Dallmeyer},
  year = {1991},
  doi = {10.3133/i2163},
  url = {https://pubs.usgs.gov/publication/i2163},
  note = {Source identifier: i2163}
}