@misc{indiciaed4e8f2560456,
  title = {Update: World Coal Quality Inventory -- Peru},
  author = {William E. Brooks and Jason C. Willett},
  year = {2004},
  doi = {10.3133/ofr20041023},
  url = {https://pubs.usgs.gov/publication/ofr20041023},
  note = {Source identifier: ofr20041023}
}