@misc{indiciae4f1afb80e62a,
  title = {Natural low-pH environments unaffected by human activity},
  author = {Robert G. Eppinger and Ron Fuge},
  year = {2009},
  doi = {10.1016/j.apgeochem.2008.11.020},
  url = {https://pubs.usgs.gov/publication/70044711},
  note = {Source identifier: 70044711}
}