@misc{indiciae6ab2bbfe791a,
  title = {Summary of the hydrogeology of the Valley and Ridge, Blue Ridge, and Piedmont Physiographic Provinces in the eastern United States},
  author = {Lindsay A. Swain and Thomas O. Mesko and Este F. Hollyday},
  year = {2004},
  doi = {10.3133/pp1422a},
  url = {https://pubs.usgs.gov/publication/pp1422A},
  note = {Source identifier: pp1422A}
}