@misc{indiciaea2710a6be00f,
  title = {Palynological investigations in the Pennsylvanian of Kentucky - VII},
  author = {Robert M. Kosanke},
  year = {1972},
  doi = {10.3133/ofr72211},
  url = {https://pubs.usgs.gov/publication/ofr72211},
  note = {Source identifier: ofr72211}
}