@misc{indiciae87e6285a59ae,
  title = {Geology of the Varilla quadrangle, Kentucky-Virginia},
  author = {Kenneth John Englund and Edwin R. Landis and Henry L. Smith},
  year = {1963},
  doi = {10.3133/gq190},
  url = {https://pubs.usgs.gov/publication/gq190},
  note = {Source identifier: gq190}
}