@misc{indiciae836766f15d29,
  title = {Digital geologic map of Loudoun County, Virginia},
  author = {C.S. Southworth and W.C. Burton and J.S. Schindler and A.J. Froelich and Remo Nardini and Pete G. Chirico and J.E. Reddy},
  year = {1999},
  doi = {10.3133/ofr99150},
  url = {https://pubs.usgs.gov/publication/ofr99150},
  note = {Source identifier: ofr99150}
}