@misc{indiciae214e43f02b90,
  title = {Lanthanide, yttrium, and zirconium anomalies in the Fire Clay coal bed, Eastern Kentucky},
  author = {J.C. Hower and L.F. Ruppert and C.F. Eble},
  year = {1999},
  doi = {10.1016/s0166-5162(98)00043-3},
  url = {https://pubs.usgs.gov/publication/70021740},
  note = {Source identifier: 70021740}
}