@misc{indiciaedf415f46e2db,
  title = {Description of techniques to drill, complete, and develop wells and to test and sample aquifers at a surface coal mine in northwestern Colorado},
  author = {R.S. Williams and G. M. Clark},
  year = {1993},
  doi = {10.3133/wri924067},
  url = {https://pubs.usgs.gov/publication/wri924067},
  note = {Source identifier: wri924067}
}