@misc{indiciae6e10cd0e8983,
  title = {Mica deposits of the southeastern Piedmont, Part 3, Ridgeway-Sandy Ridge district, Virginia and North Carolina; Part 4, Outlying deposits in Virginia},
  author = {W. R. Griffitts and R. H. Jahns and R. W. Lemke},
  year = {1953},
  doi = {10.3133/pp248c},
  url = {https://pubs.usgs.gov/publication/pp248C},
  note = {Source identifier: pp248C}
}