@misc{indiciaef6dae80fe571,
  title = {Carbon and nitrogen isotopic compositions of particulate organic matter in four large river systems across the United States},
  author = {C. Kendall and S. R. Silva and V.J. Kelly},
  year = {2001},
  doi = {10.1002/hyp.216},
  url = {https://pubs.usgs.gov/publication/70023269},
  note = {Source identifier: 70023269}
}