@misc{indiciae8521d97d4614,
  title = {Potentiometric surface maps and water-level change map, 1960-76, for the lower aquifer of the Cretaceous Potomac Group in Fairfax County, Virginia},
  author = {Richard H. Johnston and J. D. Larson},
  year = {1977},
  doi = {10.3133/ofr77284},
  url = {https://pubs.usgs.gov/publication/ofr77284},
  note = {Source identifier: ofr77284}
}