@misc{indiciaea4194fed6b61,
  title = {Ground Water Atlas of the United States: Segment 11, Delaware, Maryland, New Jersey, North Carolina, Pennsylvania, Virginia, West Virginia},
  author = {Henry Trapp and Marilee A. Horn},
  year = {1997},
  doi = {10.3133/ha730l},
  url = {https://pubs.usgs.gov/publication/ha730L},
  note = {Source identifier: ha730L}
}