@misc{indiciae6746de244756,
  title = {Hypogene caves of the central Appalachian Shenandoah Valley in Virginia},
  author = {Daniel H. Doctor and Wil Orndorff},
  year = {2017},
  doi = {10.1007/978-3-319-53348-3\_46},
  url = {https://pubs.usgs.gov/publication/70191112},
  note = {Source identifier: 70191112}
}