@misc{indiciae97909ae9e83d,
  title = {Geologic map of the Big A Mountain quadrangle, Buchanan and Russell Counties, Virginia},
  author = {Ralph L. Miller and Charles R. Meissner},
  year = {1973},
  doi = {10.3133/ofr73186},
  url = {https://pubs.usgs.gov/publication/ofr73186},
  note = {Source identifier: ofr73186}
}