@misc{indiciae02a92ce2d363,
  title = {The study of humic substances--In search of a paradigm},
  author = {Robert L. Wershaw},
  year = {2000},
  doi = {10.1016/b978-1-85573-807-2.50005-9},
  url = {https://pubs.usgs.gov/publication/70198494},
  note = {Source identifier: 70198494}
}