@misc{indiciae3abfcbb4bff9,
  title = {Interlaboratory comparison of mineral constituents in a sample from the Herrin (No. 6) coal bed from Illinois},
  author = {Robert B. Finkelman and F.L. Fiene and R.N. Miller and F.O. Simon},
  year = {1984},
  doi = {10.3133/cir932},
  url = {https://pubs.usgs.gov/publication/cir932},
  note = {Source identifier: cir932}
}