@misc{indiciaefaa05018458d,
  title = {Southeastern Pennsylvania ground water protected area},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1998},
  doi = {10.3133/ofr98571},
  url = {https://pubs.usgs.gov/publication/ofr98571},
  note = {Source identifier: ofr98571}
}