@misc{indiciae60a3a1f47b6b,
  title = {Reconnaissance surficial geologic map of the mountainous parts of Loudoun County, Virginia},
  author = {Robert B. Jacobson and R. C. McDowell and D.J. Milton and Wayne L. Newell and J. S. Pomeroy and J.S. Schindler and C.S. Southworth},
  year = {1990},
  doi = {10.3133/ofr90205},
  url = {https://pubs.usgs.gov/publication/ofr90205},
  note = {Source identifier: ofr90205}
}