@misc{indiciaeea432ab0abd9,
  title = {Map showing mineral resources of Fairfax County, Virginia; availability and planning for future needs},
  author = {A.J. Froelich},
  year = {1976},
  doi = {10.3133/ofr76660},
  url = {https://pubs.usgs.gov/publication/ofr76660},
  note = {Source identifier: ofr76660}
}