@misc{indiciae53f34b85cb88,
  title = {Geologic map of the Cumberland City quadrangle, southern Kentucky},
  author = {Richard Quintin Lewis and Robert Emerson Thaden},
  year = {1965},
  doi = {10.3133/gq475},
  url = {https://pubs.usgs.gov/publication/gq475},
  note = {Source identifier: gq475}
}