@misc{indiciaefd620855c81e,
  title = {Rock control and tectonism: their importance in shaping the Appalachian Highlands},
  author = {John Tilton Hack},
  year = {1978},
  doi = {10.3133/ofr78403},
  url = {https://pubs.usgs.gov/publication/ofr78403},
  note = {Source identifier: ofr78403}
}