@misc{indiciae0cf5bf72b49f,
  title = {Geohydrology and ground-water quality, Big Elk Creek Basin, Chester County, Pennsylvania, and Cecil County, Maryland},
  author = {Ronald A. Sloto},
  year = {2002},
  doi = {10.3133/wri024057},
  url = {https://pubs.usgs.gov/publication/wri024057},
  note = {Source identifier: wri024057}
}