@misc{indiciaecbc0c36bb5da,
  title = {Preliminary integrated geologic map databases for the United States: Kentucky, Ohio, Tennessee, and West Virginia},
  author = {Suzanne W. Nicholson and Connie L. Dicken and John D. Horton and Keith A. Labay and Michael P. Foose and Julia A. L. Mueller},
  year = {2005},
  doi = {10.3133/ofr20051324},
  url = {https://pubs.usgs.gov/publication/ofr20051324},
  note = {Source identifier: ofr20051324}
}