@misc{indiciae325db5d56103,
  title = {Chemical analysis of 617 coal samples from the Eastern United States},
  author = {Peter Zubovic and Charles L. Oman and S.L. Coleman and Linda Bragg and P.T. Kerr and K.M. Kozey and F.O. Simon and J.J. Rowe and J.H. Medlin and F.E. Walker},
  year = {1979},
  doi = {10.3133/ofr79665},
  url = {https://pubs.usgs.gov/publication/ofr79665},
  note = {Source identifier: ofr79665}
}