@misc{indiciae2ea1a057391d,
  title = {Map of the Berea and Murrysville sands of southeastern Ohio, northern West Virginia, and southwestern Pennsylvania},
  author = {David F. Demarest and Wallace De Witt},
  year = {1948},
  doi = {10.3133/om89},
  url = {https://pubs.usgs.gov/publication/om89},
  note = {Source identifier: om89}
}