@misc{indiciaee09a12dffe31,
  title = {Middle Pennsylvanian plant fossils: Problematic occurrence in the Bronx},
  author = {E-an Zen and S.H. Mamay},
  year = {1968},
  doi = {10.1126/science.161.3837.157},
  url = {https://pubs.usgs.gov/publication/70011521},
  note = {Source identifier: 70011521}
}