@misc{indiciae787aedc9fd0c,
  title = {Geology of the Valley and Ridge Province between Delaware Water Gap and Lehigh Gap, Pennsylvania},
  author = {Jack B. Epstein and Anita G. Epstein},
  year = {1969},
  url = {https://pubs.usgs.gov/publication/70231226},
  note = {Source identifier: 70231226}
}