@misc{indiciaee02e06375c33,
  title = {Nitrate stable isotopes: Tools for determining nitrate sources among different land uses in the Mississippi River Basin},
  author = {Cecily C.Y. Chang and C. Kendall and S. R. Silva and W.A. Battaglin and K. Campbell},
  year = {2002},
  doi = {10.1139/f02-153},
  url = {https://pubs.usgs.gov/publication/70023878},
  note = {Source identifier: 70023878}
}