@misc{indiciae290f6b6d27c4,
  title = {Digital computer modeling for estimating mine-drainage problems, Piceance Creek basin, northwestern Colorado},
  author = {Donald L. Coffin and John D. Bredehoeft},
  year = {1969},
  doi = {10.3133/ofr6953},
  url = {https://pubs.usgs.gov/publication/ofr6953},
  note = {Source identifier: ofr6953}
}