@misc{indiciaef7b07bbb6b5d,
  title = {Geology of the western Piedmont in Virginia},
  author = {James P. Hibbard and James S. Beard and William S. Henika and J. Wright Horton},
  year = {2016},
  url = {https://pubs.usgs.gov/publication/70179665},
  note = {Source identifier: 70179665}
}