@misc{indiciae496cbe5ecbf1,
  title = {Geology of the Bedford shale and Berea sandstone in the Appalachian basin},
  author = {J. F. Pepper and Wallace De Witt and D. F. Demarest},
  year = {1954},
  doi = {10.3133/pp259},
  url = {https://pubs.usgs.gov/publication/pp259},
  note = {Source identifier: pp259}
}