@misc{indiciae97483190e264,
  title = {Seasonal and annual load of herbicides from the Mississippi River Basin to the Gulf of Mexico},
  author = {G. M. Clark and D. A. Goolsby and W.A. Battaglin},
  year = {1999},
  doi = {10.1021/es980962u},
  url = {https://pubs.usgs.gov/publication/70185244},
  note = {Source identifier: 70185244}
}