@misc{indiciaeb656fbd26245,
  title = {Controls on boron and germanium distribution in the low-sulfur Amos coal bed, Western Kentucky coalfield, USA},
  author = {J.C. Hower and L.F. Ruppert and D.A. Williams},
  year = {2002},
  doi = {10.1016/s0166-5162(02)00151-9},
  url = {https://pubs.usgs.gov/publication/70023797},
  note = {Source identifier: 70023797}
}