@misc{indiciae28774be58ca7,
  title = {Thickness of overburden map, Falls Church Quadrangle, Virginia and Maryland},
  author = {William S. Kirk and A.J. Froelich},
  year = {1979},
  doi = {10.3133/ofr79395},
  url = {https://pubs.usgs.gov/publication/ofr79395},
  note = {Source identifier: ofr79395}
}