@misc{indiciae87956dc37289,
  title = {Palynological studies of Middle Pennsylvanian coal beds of the proposed Pennsylvania System stratotype in West Virginia},
  author = {R.M. Kosanke},
  year = {1988},
  doi = {10.3133/pp1455},
  url = {https://pubs.usgs.gov/publication/pp1455},
  note = {Source identifier: pp1455}
}