@misc{indiciae4221aaa51566,
  title = {Equivalent weight of humic acid from peat},
  author = {A. M. Pommer and Irving A. Breger},
  year = {1960},
  doi = {10.1016/0016-7037(60)90137-x},
  url = {https://pubs.usgs.gov/publication/70009817},
  note = {Source identifier: 70009817}
}