@misc{indiciae2b6ecd2a3a17,
  title = {Geochemistry of Selected Coal Samples from Sumatra, Kalimantan, Sulawesi, and Papua, Indonesia},
  author = {Harvey E. Belkin and Susan J. Tewalt},
  year = {2007},
  doi = {10.3133/ofr20071202},
  url = {https://pubs.usgs.gov/publication/ofr20071202},
  note = {Source identifier: ofr20071202}
}