@misc{indiciae2dc3dad429db,
  title = {Geologic map of the Hackett quadrangle, Washington County, Pennsylvania},
  author = {Bion H. Kent},
  year = {1967},
  doi = {10.3133/gq630},
  url = {https://pubs.usgs.gov/publication/gq630},
  note = {Source identifier: gq630}
}