@misc{indiciae71eeb98852a1,
  title = {Inventario mundial de la calidad del carbon mineral (WoCQI) [The world coal quality inventory (WoCQI)]},
  author = {R. B. Finkelman and V.S. Lovern},
  year = {2001},
  doi = {10.3133/fs05801},
  url = {https://pubs.usgs.gov/publication/fs05801},
  note = {Source identifier: fs05801}
}