@misc{indiciaede27fecdca19,
  title = {The geology of the Kutztown and Hamburg 7 1/2-minute quadrangles, eastern Pennsylvania},
  author = {G. G. Lash},
  year = {1982},
  doi = {10.3133/ofr82493},
  url = {https://pubs.usgs.gov/publication/ofr82493},
  note = {Source identifier: ofr82493}
}