@misc{indiciaeaf9489bd8615,
  title = {Geologic map of the Kutztown quadrangle, Berks and Lehigh Counties, Pennsylvania},
  author = {Gary George Lash},
  year = {1985},
  doi = {10.3133/gq1577},
  url = {https://pubs.usgs.gov/publication/gq1577},
  note = {Source identifier: gq1577}
}