@misc{indiciaedbd09e4d1b84,
  title = {Measured sections of Ordovician strata in east-central Kentucky},
  author = {W. L. Peterson and W. C. Swadley},
  year = {1979},
  doi = {10.3133/ofr791664},
  url = {https://pubs.usgs.gov/publication/ofr791664},
  note = {Source identifier: ofr791664}
}