@misc{indiciae81a88b226c5e,
  title = {Regional Aquifer-System Analysis— Appalachian Valley and Piedmont},
  author = {U.S. Geological Survey},
  year = {2004},
  doi = {10.3133/pp1422},
  url = {https://pubs.usgs.gov/publication/pp1422},
  note = {Source identifier: pp1422}
}