@misc{indiciaea6742c8d292c,
  title = {Geologic map of the Slatedale quadrangle, Lehigh and Carbon Counties, Pennsylvania},
  author = {Peter T. Lyttle and Gary George Lash and Jack Burton Epstein},
  year = {1986},
  doi = {10.3133/gq1598},
  url = {https://pubs.usgs.gov/publication/gq1598},
  note = {Source identifier: gq1598}
}