@misc{indiciae9050eddfbe94,
  title = {Structure of the Berea oil sand in the Woodsfield quadrangle, Belmont, Monroe, Noble, and Guernsey counties, Ohio},
  author = {D. D. Condit},
  year = {1916},
  doi = {10.3133/b621o},
  url = {https://pubs.usgs.gov/publication/b621O},
  note = {Source identifier: b621O}
}