@misc{indiciae0c460cc7e47c,
  title = {Assessment of characteristics and remedial alternatives for abandoned mine drainage : case study at Staple Bend Tunnel unit of Allegheny Portage Railroad National Historic Site, Cambria County, Pennsylvania, 2004},
  author = {Charles A. Cravotta},
  year = {2005},
  doi = {10.3133/ofr20051283},
  url = {https://pubs.usgs.gov/publication/ofr20051283},
  note = {Source identifier: ofr20051283}
}