@misc{indiciaef122b6033d4a,
  title = {Palynological investigations in the Pennsylvanian of Kentucky-IV},
  author = {Robert M. Kosanke},
  year = {1968},
  doi = {10.3133/ofr68161},
  url = {https://pubs.usgs.gov/publication/ofr68161},
  note = {Source identifier: ofr68161}
}