@misc{indiciae3837daaaf0d8,
  title = {Identification of plant megafossils in Pennsylvanian-age coal},
  author = {R.B. Winston},
  year = {1989},
  doi = {10.1016/0034-6667(89)90024-9},
  url = {https://pubs.usgs.gov/publication/70016407},
  note = {Source identifier: 70016407}
}