@misc{indiciaec7959ae72d59,
  title = {The quality of our nation's waters: Water quality in the Principal Aquifers of the Piedmont, Blue Ridge, and Valley and Ridge regions, eastern United States, 1993-2009},
  author = {Bruce D. Lindsey and Tammy M. Zimmerman and Melinda J. Chapman and Charles A. Cravotta and Zoltan Szabo},
  year = {2015},
  doi = {10.3133/cir1354},
  url = {https://pubs.usgs.gov/publication/cir1354},
  note = {Source identifier: cir1354}
}