@misc{indiciae0437ce75fded,
  title = {Nitrogen input to the Gulf of Mexico},
  author = {D. A. Goolsby and W.A. Battaglin and Brent T. Aulenbach and R. P. Hooper},
  year = {2001},
  doi = {10.2134/jeq2001.302329x},
  url = {https://pubs.usgs.gov/publication/70023236},
  note = {Source identifier: 70023236}
}