@misc{indiciae6287624f05f9,
  title = {Muscovite in the Spruce Pine district, North Carolina},
  author = {J. C. Olson},
  year = {1942},
  doi = {10.3133/ofr4220},
  url = {https://pubs.usgs.gov/publication/ofr4220},
  note = {Source identifier: ofr4220}
}