@misc{indiciae88726df81b06,
  title = {Map of the Berea sand of southern Ohio, eastern Kentucky, and southwestern West Virginia},
  author = {James F. Pepper and D. F. Demarest and C.W. Merrels and Wallace De Witt},
  year = {1946},
  doi = {10.3133/om69},
  url = {https://pubs.usgs.gov/publication/om69},
  note = {Source identifier: om69}
}