@misc{indiciaeea58dbe83a5f,
  title = {Hydrology and water quality of the copper-nickel study region, northeastern Minnesota},
  author = {Donald I. Siegel and Donald W. Ericson},
  year = {1980},
  doi = {10.3133/ofr80739},
  url = {https://pubs.usgs.gov/publication/ofr80739},
  note = {Source identifier: ofr80739}
}