@misc{indiciae5a5e3bfa2bb4,
  title = {Underclay deposits of Somerset and eastern Fayette Counties, Pennsylvania},
  author = {John W. Hosterman},
  year = {1972},
  doi = {10.3133/b1363},
  url = {https://pubs.usgs.gov/publication/b1363},
  note = {Source identifier: b1363}
}