@misc{indiciae261736b6ff1b,
  title = {Lateral variation in geochemistry, petrology, and palynology in the Elswick coal bed, Pike County, Kentucky},
  author = {J.C. Hower and L.F. Ruppert and C.F. Eble},
  year = {2007},
  doi = {10.1016/j.coal.2006.04.007},
  url = {https://pubs.usgs.gov/publication/70033013},
  note = {Source identifier: 70033013}
}