@misc{indiciae230b10d1e286,
  title = {Chemical analysis and modes of occurrence of selected trace elements in a Powder River basin coal and its corresponding simulated cleaned coal},
  author = {Curtis A. Palmer and Stanley J. Mroczkowski and Allan Kolker and Robert B. Finkelman and John H. Bullock},
  year = {2001},
  doi = {10.3133/ofr00323},
  url = {https://pubs.usgs.gov/publication/ofr00323},
  note = {Source identifier: ofr00323}
}