@misc{indiciae5583f6d4f2e1,
  title = {Relationship of landslides to fractures in Potomac Group deposits, Fairfax County, Virginia},
  author = {William H. Langer and Stephen F. Obermeier},
  year = {1978},
  doi = {10.3133/ofr78779},
  url = {https://pubs.usgs.gov/publication/ofr78779},
  note = {Source identifier: ofr78779}
}