@misc{indiciaeec9990ccfb57,
  title = {Palynological investigations in the upper Cretaceous and Tertiary of the Mississippi embayment region - IV},
  author = {Robert H. Tschudy},
  year = {1967},
  doi = {10.3133/ofr67222},
  url = {https://pubs.usgs.gov/publication/ofr67222},
  note = {Source identifier: ofr67222}
}