@misc{indiciaec1b6130de705,
  title = {Geologic map of the Stafford quadrangle, Stafford County, Virginia},
  author = {Robert B. Mixon and Louis Pavlides and J. Wright Horton and David S. Powars and J. Stephen Schindler},
  year = {2005},
  doi = {10.3133/sim2841},
  url = {https://pubs.usgs.gov/publication/sim2841},
  note = {Source identifier: sim2841}
}