@misc{indiciae9857933d06e8,
  title = {High-grade clays of the eastern United States with notes on some western clays},
  author = {Heinrich Ries and William Shirley Bayley},
  year = {1922},
  doi = {10.3133/b708},
  url = {https://pubs.usgs.gov/publication/b708},
  note = {Source identifier: b708}
}