@misc{indiciaea3197fc0bdfb,
  title = {Geology of the Gradyville quadrangle, Kentucky},
  author = {Alfred R. Taylor},
  year = {1963},
  doi = {10.3133/gq233},
  url = {https://pubs.usgs.gov/publication/gq233},
  note = {Source identifier: gq233}
}