@misc{indiciae15f07a9fb0b4,
  title = {Slope stability map of Fairfax County, Virginia},
  author = {S. F. Obermeier},
  year = {1979},
  doi = {10.3133/mf1072},
  url = {https://pubs.usgs.gov/publication/mf1072},
  note = {Source identifier: mf1072}
}