@misc{indiciae4eae17bd9f92,
  title = {Chemical analysis of 659 coal samples from the eastern United States},
  author = {Peter Zubovic and Charles L. Oman and Linda J. Bragg and S.L. Coleman and N. H. Rega and M.E. Lemaster and H.J. Rose and D. W. Golightly and John Puskas},
  year = {1980},
  doi = {10.3133/ofr802003},
  url = {https://pubs.usgs.gov/publication/ofr802003},
  note = {Source identifier: ofr802003}
}