@misc{indiciaed3aa7001b640,
  title = {Key to the recognition of normapolles and some morphologically similar pollen genera},
  author = {D.J. Batten and R. A. Christopher},
  year = {1981},
  doi = {10.1016/0034-6667(81)90117-2},
  url = {https://pubs.usgs.gov/publication/70011822},
  note = {Source identifier: 70011822}
}