@misc{indiciae76362ec7e8a0,
  title = {Geology of the Harrisonburg and Bridgewater quadrangles, Virginia},
  author = {Thomas M. Gathright and Peter S. Frischmann},
  year = {1986},
  url = {https://pubs.usgs.gov/publication/70198911},
  note = {Source identifier: 70198911}
}