@misc{indiciaedd0c414bf383,
  title = {Geology of the Marshall Quadrangle, Fauquier County, Virginia},
  author = {Gilbert H. Espenshade},
  year = {1986},
  doi = {10.3133/b1560},
  url = {https://pubs.usgs.gov/publication/b1560},
  note = {Source identifier: b1560}
}