@misc{indiciae60985f7444cb,
  title = {Design and performance of limestone drains to increase pH and remove metals from acidic mine drainage, Chapter 2},
  author = {Charles A. Cravotta and George R. Watzlaf},
  year = {2002},
  url = {https://pubs.usgs.gov/publication/70189383},
  note = {Source identifier: 70189383}
}