@misc{indiciae9130e76182cb,
  title = {Preliminary identification of ground-water nitrate sources using nitrogen and carbon stable isotopes, Kansas},
  author = {M.A. Townsend and S.A. Macko},
  year = {2007},
  url = {https://pubs.usgs.gov/publication/70031691},
  note = {Source identifier: 70031691}
}