@misc{indiciae18fe0becc40d,
  title = {Geologic map of the Wind Gap Quadrangle, Northampton and Monroe counties, Pennsylvania},
  author = {Jack Burton Epstein},
  year = {1987},
  doi = {10.3133/ofr87157},
  url = {https://pubs.usgs.gov/publication/ofr87157},
  note = {Source identifier: ofr87157}
}