@misc{indiciae7c2371376154,
  title = {Ground-water supplies in shale and sandstone in Fairfax, Loudoun, and Prince William Counties, Virginia},
  author = {Paul McKelvey Johnston},
  year = {1960},
  doi = {10.3133/cir424},
  url = {https://pubs.usgs.gov/publication/cir424},
  note = {Source identifier: cir424}
}