@misc{indiciaed13ac3f1c39d,
  title = {Preliminary geologic map of the Winchester 30 x 60 Minute Quadrangle, West Virginia, Virginia, and Maryland},
  author = {R. C. McDowell},
  year = {1991},
  doi = {10.3133/ofr9122},
  url = {https://pubs.usgs.gov/publication/ofr9122},
  note = {Source identifier: ofr9122}
}