@misc{indiciae0c47b08f0fe7,
  title = {Coal petrographic laboratory procedures and safety manual},
  author = {T.A. Moore and R.W. Stanton},
  year = {1985},
  doi = {10.3133/ofr8520},
  url = {https://pubs.usgs.gov/publication/ofr8520},
  note = {Source identifier: ofr8520}
}