@misc{indiciae97077fbb8429,
  title = {Dissolved metals and associated constituents in abandoned coal-mine discharges, Pennsylvania, USA. Part 2: Geochemical controls on constituent concentrations},
  author = {C.A. Cravotta},
  year = {2008},
  doi = {10.1016/j.apgeochem.2007.10.003},
  url = {https://pubs.usgs.gov/publication/70033617},
  note = {Source identifier: 70033617}
}