@misc{indiciae412e8b7c1c22,
  title = {Coal resources of Virginia},
  author = {Andrew Brown and Henry L. Berryhill and Dorothy A. Taylor and James V. A. Trumbull},
  year = {1952},
  doi = {10.3133/cir171},
  url = {https://pubs.usgs.gov/publication/cir171},
  note = {Source identifier: cir171}
}