@misc{indiciae414af85167fd,
  title = {Radioactive Elements in Coal and Fly Ash: Abundance, Forms, and Environmental Significance},
  author = {Robert A. Zielinski and Robert B. Finkelman},
  year = {1997},
  doi = {10.3133/fs16397},
  url = {https://pubs.usgs.gov/publication/fs16397},
  note = {Source identifier: fs16397}
}