@misc{indiciae37cebe8e2a59,
  title = {The kaolin minerals},
  author = {C. S. Ross and P. F. Kerr},
  year = {1931},
  doi = {10.3133/pp165e},
  url = {https://pubs.usgs.gov/publication/pp165E},
  note = {Source identifier: pp165E}
}