@misc{indiciaeb5899b88598e,
  title = {Clay minerals in the mudstones of the ore-bearing formations of the Colorado Plateau},
  author = {W.D. Keller},
  year = {1955},
  doi = {10.3133/tei515},
  url = {https://pubs.usgs.gov/publication/tei515},
  note = {Source identifier: tei515}
}