@misc{indiciae181f54a3e337,
  title = {Geologic map of the California quadrangle, Washington and Fayette Counties, Pennsylvania},
  author = {Stanley P. Schweinfurth},
  year = {1967},
  doi = {10.3133/gq648},
  url = {https://pubs.usgs.gov/publication/gq648},
  note = {Source identifier: gq648}
}