@misc{indiciaef59adda0880e,
  title = {Negative pH and extremely acidic mine waters from Iron Mountain, California},
  author = {D. Kirk Nordstrom and Charles N. Alpers and C.J. Ptacek and D.W. Blowes},
  year = {1999},
  doi = {10.1021/es990646v},
  url = {https://pubs.usgs.gov/publication/70022523},
  note = {Source identifier: 70022523}
}