@misc{indiciaeb875235f4535,
  title = {Geologic map of the Dundee quadrangle, Ohio County, Kentucky},
  author = {Gus H. Goudarzi and Avery E. Smith},
  year = {1968},
  doi = {10.3133/gq688},
  url = {https://pubs.usgs.gov/publication/gq688},
  note = {Source identifier: gq688}
}