@misc{indiciae51c0df5f24c3,
  title = {Acid-rock drainage at Skytop, Centre County, Pennsylvania, 2004},
  author = {Jane M. Hammarstrom and Keith Brady and Charles A. Cravotta},
  year = {2005},
  doi = {10.3133/ofr20051148},
  url = {https://pubs.usgs.gov/publication/ofr20051148},
  note = {Source identifier: ofr20051148}
}