@misc{indiciae99e91ade8d37,
  title = {Engineering geology of soils and weathered rocks of Fairfax County, Virginia},
  author = {Stephen F. Obermeier},
  year = {1979},
  doi = {10.3133/ofr791221},
  url = {https://pubs.usgs.gov/publication/ofr791221},
  note = {Source identifier: ofr791221}
}