@misc{indiciae781a4d3829a7,
  title = {Map of the Big Ridge mica mine, Haywood County, North Carolina},
  author = {J. C. Olson and J.J. Page},
  year = {1942},
  doi = {10.3133/ofr4221},
  url = {https://pubs.usgs.gov/publication/ofr4221},
  note = {Source identifier: ofr4221}
}