@misc{indiciaefeb1fd7a7613,
  title = {Chemistry and palynology of carbon seams and associated rocks from the Witwatersrand goldfields, South Africa},
  author = {L.B. Ebert and E. I. Robbins and K.D. Rose and R.V. Kastrup and J.C. Scanlon and L.A. Gebhard and A.R. Garcia},
  year = {1990},
  doi = {10.1016/0169-1368(90)90045-o},
  url = {https://pubs.usgs.gov/publication/70015993},
  note = {Source identifier: 70015993}
}