@misc{indiciae30c4affc4e84,
  title = {Chemical evolution of Miocene wood: Example from the Belchatow brown coal deposit, central Poland},
  author = {A. Drobniak and Maria Mastalerz},
  year = {2006},
  doi = {10.1016/j.coal.2005.06.004},
  url = {https://pubs.usgs.gov/publication/70030279},
  note = {Source identifier: 70030279}
}