@misc{indiciaecd04ef799ed7,
  title = {Geologic map of the Louisville East Quadrangle, Jefferson County, Kentucky},
  author = {R.C. Kepferle},
  year = {1974},
  doi = {10.3133/ofr7419},
  url = {https://pubs.usgs.gov/publication/ofr7419},
  note = {Source identifier: ofr7419}
}