@misc{indiciae9e75b7457c71,
  title = {Molecular aggregation of humic substances},
  author = {Robert L. Wershaw},
  year = {1999},
  doi = {10.1097/00010694-199911000-00004},
  url = {https://pubs.usgs.gov/publication/70021200},
  note = {Source identifier: 70021200}
}