@misc{indiciae6eff9cdd5356,
  title = {Analytical methods utilized by the United States Geological Survey for the analysis of coal and coal combustion by-products},
  author = {John H. Bullock and James D. Cathcart and William J. Betterton},
  year = {2002},
  doi = {10.3133/ofr02389},
  url = {https://pubs.usgs.gov/publication/ofr02389},
  note = {Source identifier: ofr02389}
}