@misc{indiciae4a683a7fea38,
  title = {Field method for the determination of zinc in plants},
  author = {Laura E. Reichen and Hubert William Lakin},
  year = {1949},
  doi = {10.3133/cir41},
  url = {https://pubs.usgs.gov/publication/cir41},
  note = {Source identifier: cir41}
}