@misc{indiciaef85fa19c964a,
  title = {Municipalities, school districts, and selected other features related to quadrangle topographic maps, Greater Pittsburgh region, Pennsylvania},
  author = {Pauline F. Silsley and Reginald Peter Briggs},
  year = {1973},
  doi = {10.3133/ofr73262},
  url = {https://pubs.usgs.gov/publication/ofr73262},
  note = {Source identifier: ofr73262}
}