@misc{indiciae642fb45befb5,
  title = {Geologic map of the Timberville quadrangle, Virginia},
  author = {Matthew J. Heller and Randall C. Orndorff and David A. Hubbard and Eugene K. Rader},
  year = {2018},
  url = {https://pubs.usgs.gov/publication/70197638},
  note = {Source identifier: 70197638}
}