@misc{indiciae1bc0aba1dbef,
  title = {Water-quality assessment of part of the upper Mississippi River Basin, Minnesota and Wisconsin — Nitrogen and phosphorus in streams, streambed sediment, and ground water, 1971-94},
  author = {Sharon E. Kroening and William J. Andrews},
  year = {1997},
  doi = {10.3133/wri974107},
  url = {https://pubs.usgs.gov/publication/wri974107},
  note = {Source identifier: wri974107}
}