@misc{indiciae2367eaa3abc2,
  title = {Geology of the Upperville 7.5-minute quadrangle, Fauquier and Loudoun counties, Virginia},
  author = {A. E. Nelson},
  year = {1997},
  doi = {10.3133/ofr97708},
  url = {https://pubs.usgs.gov/publication/ofr97708},
  note = {Source identifier: ofr97708}
}