@misc{indiciae51dc918e4c75,
  title = {Geologic map of the Clarksville South and Tungsten 7.5-minute quadrangles, Virginia and North Carolina},
  author = {J. D. Peper and T. W. Clark and K. A. Kanahele},
  year = {1996},
  doi = {10.3133/i2471},
  url = {https://pubs.usgs.gov/publication/i2471},
  note = {Source identifier: i2471}
}