@misc{indiciae4ebdcdec265c,
  title = {Perlite resources of the United States},
  author = {M. C. Jaster},
  year = {1956},
  doi = {10.3133/b1027i},
  url = {https://pubs.usgs.gov/publication/b1027I},
  note = {Source identifier: b1027I}
}