@misc{indiciae19bb9c0325ab,
  title = {Teachers guide to geologic trails in Delaware Water Gap National Recreation Area, Pennsylvania–New Jersey},
  author = {Jack B. Epstein},
  year = {2010},
  doi = {10.1130/2010.0016(06)},
  url = {https://pubs.usgs.gov/publication/70207714},
  note = {Source identifier: 70207714}
}