@misc{indiciae340553f6db2c,
  title = {Miscellaneous nonmetallic products},
  author = {Willis Thomas Lee and Douglas B. Sterrett},
  year = {1913},
  doi = {10.3133/b530i},
  url = {https://pubs.usgs.gov/publication/b530I},
  note = {Source identifier: b530I}
}