@misc{indiciaeffecf3c6bbd2,
  title = {Trends in nutrient concentration and load for streams in the Mississippi River Basin, 1974-94},
  author = {Dee L. Lurry and David E. Dunn},
  year = {1997},
  doi = {10.3133/wri974223},
  url = {https://pubs.usgs.gov/publication/wri974223},
  note = {Source identifier: wri974223}
}