@misc{indiciaec8faa31f7eb3,
  title = {Influence of particle-size separation technique on concentrations of sediment-associated trace metals},
  author = {G. F. Koltun and D.R. Helsel},
  year = {1986},
  url = {https://pubs.usgs.gov/publication/70205265},
  note = {Source identifier: 70205265}
}