@misc{indiciae06ffb61a5d1c,
  title = {Geology of the Varney quadrangle, Kentucky},
  author = {John Warfield Huddle and Kenneth John Englund},
  year = {1962},
  doi = {10.3133/gq180},
  url = {https://pubs.usgs.gov/publication/gq180},
  note = {Source identifier: gq180}
}