@misc{indiciaefba5c31fc3b9,
  title = {Preliminary geologic and engineering review of the Franconia area, Fairfax County, Virginia},
  author = {Stephen F. Obermeier and A.J. Froelich},
  year = {1976},
  doi = {10.3133/ofr76273},
  url = {https://pubs.usgs.gov/publication/ofr76273},
  note = {Source identifier: ofr76273}
}