@misc{indiciae0ec4e0ad7a52,
  title = {Factors affecting groundwater quality in the Valley and Ridge aquifers, eastern United States, 1993-2002},
  author = {Gregory C. Johnson and Tammy M. Zimmerman and Bruce D. Lindsey and Eliza L. Gross},
  year = {2011},
  doi = {10.3133/sir20115115},
  url = {https://pubs.usgs.gov/publication/sir20115115},
  note = {Source identifier: sir20115115}
}