@misc{indiciae0ea705d37758,
  title = {Paleobotany and palynology of the Bristol Hill Coal Member (Bond Formation) and Friendsville Coal Member (Mattoon Formation) of the Illinois Basin (Upper Pennsylvanian)},
  author = {Debra A. Willard and T.L. Phillips},
  year = {1993},
  doi = {10.2307/3515033},
  url = {https://pubs.usgs.gov/publication/70017990},
  note = {Source identifier: 70017990}
}