@misc{indiciae18fa5a72c8fb,
  title = {Dry deposition of ammonia, nitric acid, ammonium, and nitrate to alpine tundra at Niwot Ridge, Colorado},
  author = {G. Rattray and H. Sievering},
  year = {2001},
  doi = {10.1016/s1352-2310(00)00276-4},
  url = {https://pubs.usgs.gov/publication/70023726},
  note = {Source identifier: 70023726}
}