@misc{indiciae092920b256a1,
  title = {Nutrient Concentrations and Their Relations to the Biotic Integrity of Nonwadeable Rivers in Wisconsin},
  author = {Dale M. Robertson and Brian M. Weigel and David J. Graczyk},
  year = {2008},
  doi = {10.3133/pp1754},
  url = {https://pubs.usgs.gov/publication/pp1754},
  note = {Source identifier: pp1754}
}