@misc{indiciae2c2808e9e2fe,
  title = {Geology of the Gamaliel quadrangle, Kentucky},
  author = {Donald E. Trimble},
  year = {1963},
  doi = {10.3133/gq253},
  url = {https://pubs.usgs.gov/publication/gq253},
  note = {Source identifier: gq253}
}