@misc{indiciae1a6f7117aca1,
  title = {Organic geochemical studies of the transformation of gymnospermous xylem during peatification and coalification to subbituminous coal},
  author = {Patrick G. Hatcher and H. E. Lerch and T.V. Verheyen},
  year = {1990},
  doi = {10.1016/0166-5162(89)90090-6},
  url = {https://pubs.usgs.gov/publication/70016453},
  note = {Source identifier: 70016453}
}