@misc{indiciae3c5d96453280,
  title = {Structure of the Berea oil sand in the Flushing quadrangle, Harrison, Belmont, and Guernsey Counties, Ohio},
  author = {William Tudor Griswold},
  year = {1908},
  doi = {10.3133/b346},
  url = {https://pubs.usgs.gov/publication/b346},
  note = {Source identifier: b346}
}