@misc{indiciae9415ca103e90,
  title = {Mica-bearing pegmatites of the Spruce Pine district, North Carolina},
  author = {T.L. Keeler and J. C. Olson},
  year = {1942},
  doi = {10.3133/ofr4126},
  url = {https://pubs.usgs.gov/publication/ofr4126},
  note = {Source identifier: ofr4126}
}