@misc{indiciaeb89e1a5efd52,
  title = {Geologic map of the Lykens quadrangle, Dauphin, Schuylkill, and Lebanon Counties, Pennsylvania},
  author = {J. Peter Trexler and Gordon H. Wood},
  year = {1968},
  doi = {10.3133/gq701},
  url = {https://pubs.usgs.gov/publication/gq701},
  note = {Source identifier: gq701}
}