@misc{indiciaec86697fc53b0,
  title = {Olmos coal, Maverick Basin, south Texas: From prospect to production},
  author = {C.E. Barker and Peter D. Warwick and Matt Gose and R.J. Scott},
  year = {2003},
  url = {https://pubs.usgs.gov/publication/70195467},
  note = {Source identifier: 70195467}
}