@misc{indiciae45a09db25db8,
  title = {Geologic map of the Irvington Quadrangle, Meade and Breckinridge counties, Kentucky},
  author = {D.H. Amos},
  year = {1974},
  doi = {10.3133/ofr74351},
  url = {https://pubs.usgs.gov/publication/ofr74351},
  note = {Source identifier: ofr74351}
}