@misc{indiciaede0c759c4bef,
  title = {Petrology, mineralogy and geochemistry of mined coals, western Venezuela},
  author = {Paul C. Hackley and Peter D. Warwick and Eligio Gonzalez},
  year = {2005},
  doi = {10.1016/j.coal.2005.02.006},
  url = {https://pubs.usgs.gov/publication/70195415},
  note = {Source identifier: 70195415}
}