@misc{indiciae84e771d391ff,
  title = {Geologic map of part of the Carmichaels quadrangle, southwestern Pennsylvania},
  author = {B.H. Kent},
  year = {1969},
  doi = {10.3133/i588},
  url = {https://pubs.usgs.gov/publication/i588},
  note = {Source identifier: i588}
}