@misc{indiciae7a0ad0b9be76,
  title = {Water quality in the Appalachian Valley and Ridge, the Blue Ridge, and the Piedmont Physiographic Provinces, eastern United States},
  author = {L. I. Briel},
  year = {1997},
  doi = {10.3133/pp1422d},
  url = {https://pubs.usgs.gov/publication/pp1422D},
  note = {Source identifier: pp1422D}
}