@misc{indiciae58978e0835af,
  title = {Geologic map of the Allentown East quadrangle, Lehigh, Northampton, and Bucks Counties, Pennsylvania},
  author = {Avery A. Drake},
  year = {1996},
  doi = {10.3133/ofr9622},
  url = {https://pubs.usgs.gov/publication/ofr9622},
  note = {Source identifier: ofr9622}
}