@misc{indiciaee89153a22569,
  title = {Geological map of the Catasauqua Quadrangle, Northampton and Lehigh counties, Pennsylvania},
  author = {Avery A. Drake},
  year = {1996},
  doi = {10.3133/ofr96700},
  url = {https://pubs.usgs.gov/publication/ofr96700},
  note = {Source identifier: ofr96700}
}