@misc{indiciae2395e30442cc,
  title = {Surface water qualit: Revisiting nitrate concentrations in the Des Moines River: 1945 and 1976-2001},
  author = {G.F. McIsaac and R.D. Libra},
  year = {2003},
  doi = {10.2134/jeq2003.2280},
  url = {https://pubs.usgs.gov/publication/70024957},
  note = {Source identifier: 70024957}
}