@misc{indiciae7c1889e1f169,
  title = {Copper toxicity and organic matter: Resiliency of watersheds in the Duluth Complex, Minnesota, USA},
  author = {Nadine M. Piatak and Robert R. Seal and Perry M. Jones and Laurel G. Woodruff},
  year = {2015},
  url = {https://pubs.usgs.gov/publication/70193301},
  note = {Source identifier: 70193301}
}