@misc{indiciae7f6456801213,
  title = {Natural acid drainage from altered areas within and adjacent to the upper Alamosa River basin, Colorado},
  author = {W. R. Miller and J. B. McHugh},
  year = {1994},
  doi = {10.3133/ofr94144},
  url = {https://pubs.usgs.gov/publication/ofr94144},
  note = {Source identifier: ofr94144}
}