@misc{indiciae03a5a6569498,
  title = {Data on natural organic substances in dissolved, colloidal, suspended-silt and -clay, and bed-sediment phases in the Mississippi River and some of its tributaries, 1987-90},
  author = {J.A. Leenheer and T.I. Noyes and P.A. Brown},
  year = {1994},
  doi = {10.3133/wri934204},
  url = {https://pubs.usgs.gov/publication/wri934204},
  note = {Source identifier: wri934204}
}