@misc{indiciaec01c970db033,
  title = {Effectiveness of the addition of alkaline materials at surface coal mines in preventing or abating acid mine drainage--Part 1. Geochemical considerations},
  author = {Charles A. Cravotta and Keith Brady and Michael W. Smith and Richard L. Beam},
  year = {1990},
  url = {https://pubs.usgs.gov/publication/70189559},
  note = {Source identifier: 70189559}
}