@misc{indiciae1569a721c77e,
  title = {Measured sections of Ordovician strata in north-central Kentucky},
  author = {W. C. Swadley and Warren Lee Peterson},
  year = {1979},
  doi = {10.3133/ofr79850},
  url = {https://pubs.usgs.gov/publication/ofr79850},
  note = {Source identifier: ofr79850}
}