@misc{indiciaef84783edb3d8,
  title = {Geochemistry of ground water in mine drainage problems},
  author = {Ivan Barnes and F.E. Clarke},
  year = {1964},
  doi = {10.3133/pp473a},
  url = {https://pubs.usgs.gov/publication/pp473A},
  note = {Source identifier: pp473A}
}