@misc{indiciaef6f8a12e4821,
  title = {Hydrogeology of and potential mining impacts on strippable lignite areas in the Denver Aquifer, east-central Colorado},
  author = {N. E. Driver and R.S. Williams},
  year = {1986},
  doi = {10.3133/wri844366},
  url = {https://pubs.usgs.gov/publication/wri844366},
  note = {Source identifier: wri844366}
}