@misc{indiciae9241b77bc0e1,
  title = {Tectonic map of the central and southern Appalachians},
  author = {John C. revised by Reed},
  year = {1968},
  doi = {10.3133/ofr68224},
  url = {https://pubs.usgs.gov/publication/ofr68224},
  note = {Source identifier: ofr68224}
}