@misc{indiciae0854d969acfb,
  title = {Eutrophication: Nitrate flux in the Mississippi River},
  author = {G.F. McIsaac and M.B. David and G.Z. Gertner and D. A. Goolsby},
  year = {2001},
  doi = {10.1038/35102672},
  url = {https://pubs.usgs.gov/publication/70022957},
  note = {Source identifier: 70022957}
}