@misc{indiciae77ca7af400e3,
  title = {Guidebook for the Annual Field Conference of Pennsylvania Geologists: Geology in the region of the Delaware to Lehigh water gaps},
  author = {Jack B. Epstein and Anita G. Epstein},
  year = {1967},
  url = {https://pubs.usgs.gov/publication/70231177},
  note = {Source identifier: 70231177}
}