@misc{indiciaefabed430c45a,
  title = {A review of the lignite resources of Arkansas},
  author = {Paul C. Hackley and Jason C. Willett and Peter D. Warwick and S.J. Law and Douglas J. Nichols},
  year = {2011},
  url = {https://pubs.usgs.gov/publication/70176225},
  note = {Source identifier: 70176225}
}