@misc{indiciae64650963c26f,
  title = {Hydrology and geochemistry of a surface coal mine in northwestern Colorado},
  author = {R.S. Williams and G. M. Clark},
  year = {1994},
  doi = {10.3133/wri924187},
  url = {https://pubs.usgs.gov/publication/wri924187},
  note = {Source identifier: wri924187}
}