@misc{indiciae456cc671efb4,
  title = {Preliminary geologic map of the Midway quadrangle, Washington County, southwestern Pennsylvania},
  author = {J.B. Roen},
  year = {1971},
  doi = {10.3133/mf319},
  url = {https://pubs.usgs.gov/publication/mf319},
  note = {Source identifier: mf319}
}