@misc{indiciaef4a22aa713a8,
  title = {Using simulated maps to interpret the geochemistry, formation and quality of the Blue Gem Coal Bed, Kentucky, USA},
  author = {Nicholas J. Geboy and Ricardo A. Olea and Mark A. Engle and Jose Antonio Martin-Fernandez},
  year = {2013},
  doi = {10.1016/j.coal.2012.10.010},
  url = {https://pubs.usgs.gov/publication/70041263},
  note = {Source identifier: 70041263}
}