@misc{indiciae5192530951f2,
  title = {Maps showing lithofacies and inferred sub-surface distribution of channel-fill sand aquifers in the Potomac Group in Fairfax County, Virginia},
  author = {Richard H. Johnston and A.J. Froelich},
  year = {1977},
  doi = {10.3133/ofr77287},
  url = {https://pubs.usgs.gov/publication/ofr77287},
  note = {Source identifier: ofr77287}
}