@misc{indiciae6bb740a6cfa9,
  title = {Mineralogical, chemical, and physical properties of the regolith overlying crystalline rocks, Fairfax County, Virginia: a preliminary report},
  author = {Gerhard W. Leo and M.J. Pavich and Stephen F. Obermeier},
  year = {1977},
  doi = {10.3133/ofr77644},
  url = {https://pubs.usgs.gov/publication/ofr77644},
  note = {Source identifier: ofr77644}
}