@misc{indiciaea9dca85bccaf,
  title = {Geologic map of the Big Stone Gap quadrangle, Virginia},
  author = {Ralph L. Miller},
  year = {1965},
  doi = {10.3133/gq424},
  url = {https://pubs.usgs.gov/publication/gq424},
  note = {Source identifier: gq424}
}