@misc{indiciae6f7afb1e24dd,
  title = {Mineral commodity profiles: nitrogen},
  author = {Deborah A. Kramer},
  year = {2004},
  doi = {10.3133/ofr20041290},
  url = {https://pubs.usgs.gov/publication/ofr20041290},
  note = {Source identifier: ofr20041290}
}