@misc{indiciae25b5453f3aec,
  title = {Map showing areas serviced by public water-supply agencies in 1973 greater Pittsburgh region, southwestern Pennsylvania},
  author = {Robert M. Beall},
  year = {1974},
  doi = {10.3133/mf607},
  url = {https://pubs.usgs.gov/publication/mf607},
  note = {Source identifier: mf607}
}