@misc{indiciaedabbe735b1ac,
  title = {Geology of the Ashland quadrangle, Kentucky-Ohio, and the Catlettsburg quadrangle in Kentucky},
  author = {Ernest Dobrovolny and Joseph A. Sharps and John C. Ferm},
  year = {1963},
  doi = {10.3133/gq196},
  url = {https://pubs.usgs.gov/publication/gq196},
  note = {Source identifier: gq196}
}