@misc{indiciae7143dd109e91,
  title = {Geologic map of the Big A Mountain quadrangle, Buchanan and Russell Counties, Virginia},
  author = {Ralph L. Miller and Charles R. Meissner},
  year = {1977},
  doi = {10.3133/gq1350},
  url = {https://pubs.usgs.gov/publication/gq1350},
  note = {Source identifier: gq1350}
}