@misc{indiciae30cae421ca5e,
  title = {Cobalt},
  author = {John F. Slack and Bryn E. Kimball and Kim B. Shedd},
  year = {2017},
  doi = {10.3133/pp1802f},
  url = {https://pubs.usgs.gov/publication/pp1802F},
  note = {Source identifier: pp1802F}
}