@misc{indiciae91b3add50899,
  title = {Ground-water resources of the Culpeper basin, Virginia and Maryland},
  author = {R. J. Laczniak and Chester Zenone},
  year = {1985},
  doi = {10.3133/i1313f},
  url = {https://pubs.usgs.gov/publication/i1313F},
  note = {Source identifier: i1313F}
}