@misc{indiciaefe5211be4cc8,
  title = {Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of inorganic and organic constituents in water and fluvial sediments},
  year = {1993},
  doi = {10.3133/ofr93125},
  url = {https://pubs.usgs.gov/publication/ofr93125},
  note = {Source identifier: ofr93125}
}