@misc{indiciae4a1785b3b428,
  title = {Physiographic divisions and differential uplift in the Piedmont and Blue Ridge},
  author = {John Tilton Hack},
  year = {1982},
  doi = {10.3133/pp1265},
  url = {https://pubs.usgs.gov/publication/pp1265},
  note = {Source identifier: pp1265}
}