@misc{indiciaedac96cea20a3,
  title = {Quantitative interpretation of mineralogical composition from X-ray and chemical data for the Pierre Shale},
  author = {L.G. Schultz},
  year = {1964},
  doi = {10.3133/pp391c},
  url = {https://pubs.usgs.gov/publication/pp391C},
  note = {Source identifier: pp391C}
}