@misc{indiciae39ff97c4981e,
  title = {Oil-shale data, cores, and samples collected by the U.S. geological survey through 1989},
  author = {John R. Dyni and Frances Gay and Thomas C. Michalski},
  year = {1990},
  url = {https://pubs.usgs.gov/publication/70015778},
  note = {Source identifier: 70015778}
}