@misc{indiciaee88a37f80bb1,
  title = {Petrology of Potomac Group sands in Fairfax County, Virginia},
  author = {Roy C. Lindholm},
  year = {1978},
  doi = {10.3133/ofr78512},
  url = {https://pubs.usgs.gov/publication/ofr78512},
  note = {Source identifier: ofr78512}
}