@misc{indiciaea3bd25812621,
  title = {Surface materials map of Fairfax County, Virginia},
  author = {William H. Langer},
  year = {1978},
  doi = {10.3133/ofr7878},
  url = {https://pubs.usgs.gov/publication/ofr7878},
  note = {Source identifier: ofr7878}
}