@misc{indiciae4a5aaf825142,
  title = {The World Coal Quality Inventory: South America},
  author = {Susan J. Tewalt and Linda J. Bragg and Robert B. Finkelman},
  year = {2006},
  doi = {10.3133/ofr20061241},
  url = {https://pubs.usgs.gov/publication/ofr20061241},
  note = {Source identifier: ofr20061241}
}