@misc{indiciaecec8649a36cc,
  title = {Geochemistry, petrology, and palynology of the Pond Creek coal bed, northern Pike and southern Martin counties, Kentucky},
  author = {J.C. Hower and L.F. Ruppert and C.F. Eble and W.L. Clark},
  year = {2005},
  doi = {10.1016/j.coal.2004.10.003},
  url = {https://pubs.usgs.gov/publication/70029251},
  note = {Source identifier: 70029251}
}