@misc{indiciae8ca902b14b53,
  title = {Statistical analyses of surface-water-quality variables in the coal area of southeastern Montana},
  author = {J. R. Knapton and Rodger F. Ferreira},
  year = {1980},
  doi = {10.3133/wri8040},
  url = {https://pubs.usgs.gov/publication/wri8040},
  note = {Source identifier: wri8040}
}