@misc{indiciae7273eb5e29ce,
  title = {Geology of the Crutchfield quadrangle in Kentucky},
  author = {Howard Gordon Wilshire},
  year = {1963},
  doi = {10.3133/gq270},
  url = {https://pubs.usgs.gov/publication/gq270},
  note = {Source identifier: gq270}
}