@misc{indiciae3b15db500388,
  title = {Engineering geology and design of slopes for Cretaceous Potomac deposits in Fairfax County, Virginia, and vicinity},
  author = {Stephen F. Obermeier},
  year = {1984},
  doi = {10.3133/b1556},
  url = {https://pubs.usgs.gov/publication/b1556},
  note = {Source identifier: b1556}
}