@misc{indiciaed3a23cd5f96b,
  title = {Illustrations of plant microfossils from the Yazoo Clay (Jackson Group, upper Eocene), Mississippi},
  author = {R.H. Tschudy and S. D. Van Loenen},
  year = {1970},
  doi = {10.3133/pp643e},
  url = {https://pubs.usgs.gov/publication/pp643E},
  note = {Source identifier: pp643E}
}