@misc{indiciaefd3ea52eaa56,
  title = {Perlite deposit near Healy, Alaska},
  author = {Clyde Wahrhaftig and Richard A. Eckhart},
  year = {1952},
  doi = {10.3133/ofr169},
  url = {https://pubs.usgs.gov/publication/ofr169},
  note = {Source identifier: ofr169}
}