@misc{indiciae4efcb098e214,
  title = {Results of the U.S. Geological Survey's Analytical Evaluation Program for standard reference samples: T-155 (trace constituents), M-148 (major constituents), N-59 (nutrient constituents), N-60 (nutrient constituents), P-31 (low ionic strength constituents), GWT-4 (ground-water trace constituents) and Hg-27 (Mercury) distributed in September 1998},
  author = {Jerry W. Farrar},
  year = {1999},
  doi = {10.3133/ofr9972},
  url = {https://pubs.usgs.gov/publication/ofr9972},
  note = {Source identifier: ofr9972}
}