@misc{indiciae6779c446e508,
  title = {Distribution and mode of occurrence of selenium in US coals},
  author = {L. Coleman and L. J. Bragg and R. B. Finkelman},
  year = {1993},
  doi = {10.1007/bf00146745},
  url = {https://pubs.usgs.gov/publication/70017967},
  note = {Source identifier: 70017967}
}